Cruise Lines International Association, or CLIA, is a trade association composed of 23 of the major cruise line companies serving North America. The site offers a Cruise Expert Locator (for locating the appropriate travel agency or counselor to book your cruise), Cruise Line & Ship Profiles (for the world's cruise lines and over 120 ships), cruise line links (to the cruise lines themselves), cruising FAQs for the new cruise traveler, destination guides, specials and much more. Easy to use and simple to navigate.
This site is run by Omega World Travel, which bills themselves as the world's largest cruise seller. In addition to their listings of cruise packages, you will find ships' reviews (sanitation ratings), deck plans, links to cruise lines, ship profiles, special cruises and more.
This is an independent site, written by a half dozen or so cruise aficionados and travel writers. It features cruise reviews and photos from members. It also hosts cruise message boards, and interactive ship rating polls, has FAQs for first time cruises, links to specials and deals and much more.