Indian Ocean and African river cruises on smaller ships. Site includes information for consumers and travel agents.

Small cruise line offering cruises on the US Eastern Seaboard on American-flagged small ships (none larger than 100 guests). Site includes ship, destination and telephone booking information.

Small line with sailings to Alaska, Pacific Northwest and Mexico on small yachts (12-36 guests each). Itineraries feature close-up viewing of wildlife. Site includes ship and itinerary information for both consumers and travel agents, but no direct booking.

Small "deluxe" cruise line positioned below luxury and above premium. Mid-size ships sail on European, Caribbean and Asian itineraries. Site contains ship and itinerary information, as well as direct booking.

Small ship, destination-oriented line with ships operating in Australia and the South Pacific. Site includes information on ships and itineraries, as well as direct booking.

Popular, mass-market cruise line with sailings to the Caribbean, Mexico, Europe and Alaska. Information about destinations, excursions, and life on board. Direct bookings.

Premium-priced line with mid to large-size vessels sailing to the Caribbean, Alaska, Europe, and South America. Site offers ship and destination information, as well as direct booking.

Tall ship sailing vessel built in modern times but with historic ambiance (steel hull, traditional sails). Dutch-registered, and sails in Europe and the Caribbean. Site has information on the ship and cruises as well as charters.

Experience the great beauty of the remote reef and Islands between Cairns and Townsville.

Large, "Italian style" contemporary cruise line with sailings in the Mediterranean and Caribbean. Site provides information ships, destinations, and current ship positions, as well as direct booking.

Small-ship line (maximum capacity 102 guests) sails in Alaska, the Pacific Northwest, Mexico, Costa Rica and northern Asia. Site contains ship and destination information, as well as a ships' blog from crewmembers.

High-end cruise line with mid-size ships which sail to relatively exotic destinations on longer itineraries. Numerous theme cruises each year with featured speakers and/or events. Site includes ship and itinerary information, as well as telephone booking and a travel agent finder.

Luxury line steeped in British ocean liner tradition. Modern fleet offers trans-Atlantic crossings, around-the-world, Caribbean and European cruises. Site includes extensive ship and "life onboard" information. Travel agent finder, but no online booking.

Family-oriented, Disney-themed cruises on modern and well-appointed ships. Itineraries include the Caribbean and Mediterranean. Site includes information about the ships and destinations, including Disney's private island, Castaway Cay.

Offer cruises to many worldwide destinations.

Cruise line with five ships sailing the Great Lakes. Includes company profile, itineraries, prices, photo gallery, descriptions of ports of call, and reviews and testimonials.

Very high-end Scottish luxury line operating small ships around Northern Europe, the Med, the Caribbean and South America. Pricing more inclusive than most and includes private escorted tours, gratuities and alcoholic beverages. Site includes ship, itinerary and telephone booking information.

Large, premium-priced line known for gracious service. Mid-sized ships sail to Alaska, Caribbean, Europe and exotic locations including an annual around-the-world cruise. Site includes ship and destination information as well as direct booking.

Exploration-oriented cruise line focused on remote, beautiful coastlines in Norway, Greenland and Antarctica. Site includes ship, itinerary and telephone booking information.

UK-targeted cruise line that sails to the Mediterranean in the summer, Caribbean in the winter, and trans-Atlantic in between. Site offers ship and itinerary information as well as direct booking.

Small Finnish line with older vessels sailing to the Baltic, Finland, Red Sea, Western Europe and the Mediterranean. Formerly known as Rannikkolinjat. Site is available in English and Finnish, and contains line information as well as a telephone number to book a cruise.

Adventure cruises and exotic vacations to the Galapagos, Alaska, and Antarctica. Site includes extensive information on ships, itineraries, affiliation with National Geographic, and telephone booking.

Offers cruises from Cyprus to the Holy Land, Egypt, Beirut, and the Greek Islands.

Italian cruise line operating in the Mediterranean, Atlantic and Caribbean. Site has ship and itinerary information. No online booking, but can request contact from a travel agent.

Australian wilderness and coral reef diving itineraries aboard the yacht True North, which features an on-board helicopter. Extensive ship and itinerary information, but no online booking.

Mass market line with large ships offering "freestyle" cruising: no set dining times, no dress codes, numerous restaurants (most for an extra charge). Sails to the Caribbean, Mexico, Alaska, and Europe. NCL also operates NCL America, a US-flagged subsidiary with ships in Hawaii. Site offers ship and itinerary information as well as online booking.

"Upscale" line positioned below luxury and above premium. Sails to exotic locations on mid-size ships. Site has information and a travel agent finder, but no direct booking.

British line with worldwide destinations including Europe, Australia, Caribbean and a World Cruise. Site includes destination information, search tools for cruise holidays, and online booking.

Large, mid-price cruise line with ships that sail to a wide range of North American and exotic destinations. Site contains detailed itinerary and ship information, as well as direct booking.

Small luxury line with mid-size ships (under 700 guests each) that sail on longer cruises to relatively exotic destinations. Website includes ship and itinerary information. Formerly known as Radisson Seven Seas Cruises.

Mass-market line known for innovative large ships with features such as rock-climbing walls and onboard surfing. Sails to the Caribbean, Mexico, Alaska, Europe, South America and Asia. Site includes information and booking.

Two tall sailing ships in the Caribbean and Mediterranean and river cruisers operating in European waterways. Site includes destinations, calendar and a trip planner.

Classic, 12-guest vessel offers natural history and wildlife adventure cruising in Glacier Bay Alaska, British Columbia and the San Juan Islands. Site includes ship history, pictures and destination information.

Small, high-end line with ships that carry up to 110 guests. Offers relatively exotic destinations and access to small ports. Site has information for charters as well as consumers and travel agents.

Luxury vacations on large yachts. Known for highly personalized service, formal atmosphere in the evenings, and water sports off the ship's own marina. Sailings to a range of exotic destinations worldwide. Site includes ship and itinerary information as well as a booking contact request form (but no online booking).

Small-ship Alaska cruises on the M.V. Sikumi, a 12-guest converted trawler. Site includes ship and destination information, as well as testimonials and guest photos.

High-end line with small ships (250-400 guests). Relatively long sailings to a range of exotic destinations around the world. Site includes ship and line information, and a trip planner but no online booking.

Value-oriented discovery and exploration-oriented cruises on a classic (i.e., older) ship to South America, Antarctica, Europe, Africa, and the Caribbean. Site includes ship and destination information, as well as online booking.

Tall ship sailing vessels in the Caribbean, the Mediterranean and the Far East. Site includes ship, destination and charter information as well as a travel agent finder.

Large Asian cruise line with modern ships sailings primarily out of Singapore, Hong Kong, and Malaysia. Offers both gambling-oriented short cruises and longer voyages. Site offers ship and itinerary information.

Luxury residences available for condo-style purchase aboard "The World" cruise liner. Occasionally short-term rentals are possible. Site includes information about the ship, itineraries and sales contacts.

Small line with small ships focused on cultural and educational travel. Sails to the Mediterranean, South America and Antarctica. Site offers information on charters as well as scheduled cruises.

Small yacht sailings in the Greek Islands and the Red Sea. Site includes photos, destination information, and brochure downloads.

Details on trips through the Greek Islands; itineraries, rates, and fleet information.

Value-oriented discovery cruises on a classic ship to exotic destinations including Antarctica, South America, Northern Europe, and the South Pacific. Site includes information for both consumers and travel agents.

Casual-atmosphere luxury cruises on small vessels (100-200 guests). Ships use sails and diesel power. Itineraries to the Mediterranean, Caribbean and Central America. Site include ship and destination information for consumers and travel agents.

Offers low-cost cruise holidays in the Greek islands and Turkey. Differentiated by a la carte pricing (food is not included), many over-nights in port, and a young demographic. Site includes ship and itinerary information as well as online booking.