Amtrak - Official Amtrak page where you can make reservations or check out schedules and information.
http://www.amtrak.com

Best Fares - Site focusing primarily on air fares.
http://www.bestfares.com

Budget Travel - More travel deals.
http://www.budgettravel.com

Cheaptickets - Similar to Travelocity, check for competitive prices.
http://www.cheaptickets.com

Expedia - Airplane tickets, cruises, lodging, rentals and more.
http://www.expedia.com

Hostels.com - Information about hostels all around the world, plus other valuable travel and tour information.
http://www.hostels.com

Hostelworld.com - Another great site for hostel reservations, tours, and information.
http://www.hostelworld.com

Last Minute Travel - Features a top 10 deals section that is updated weekly and offers a variety of accommodations and transportation.
http://www.lastminutetravel.com

Priceline - Another big gravel site accept that, unlike the others, you can name your own price.
http://www.priceline.com

Raileurope.com - Train and rail travel in Europe.
http://www.raileurope.com

Student Universe - Great rates for students and faculty on travel.
http://www.studentuniverse.com

Smarter Living - You cannot book your trip here, but it features the best bargains from nearly every other travel site on the web.
http://www.smarterliving.com

Travelocity - Site for booking airplane tickets, hotel reservations, cruises, vacations, car rentals, and more.
http://www.travelocity.com

Travelzoo - Another page with good deals on airplane tickets, logding, and car rentals.
http://www.travelzoo.com