Travel websites

Sidestep: http://www.sidestep.com/ 
Farecast: http://www.farecast.com/ 
Travelocity: http://www.travelocity.com 
Flycheapo (for Europe, para Europa): http://www.flycheapo.com/ 
Kayak: http://www.kayak.com/ 
Travelation: https://www.travelation.com/ 
Expedia (for USA, para Estados Unidos): http://www.expedia.com/ 
Travelzoo: http://www.travelzoo.com/ 
Priceline: http://priceline.com 
Tickets: http://tickets.priceline.com/default.asp 
My travel guide: http://www.mytravelguide.com/ 
Flights: http://www.mytravelguide.com/flights/ 
Last Minute Travel (Site59): http://www.lastminutetravel.com/PageDefault.aspx 

Last Minute Travel in the US: http://us.lastminute.com/index.html
Nextag: http://travel.nextag.com/travel-html 
Vayama: http://www.vayama.com/ 
Yapta: http://www.yapta.com/ 
Concierge (travel guides): http://www.concierge.com/ 

OTHER SITES

Travelistic (travel videos): http://www.travelistic.com/ 
Breezenet (rental cars): http://www.bnm.com/ 
Igougo (travel reviews): http://www.igougo.com/ 
MyTripJournal (travel logs): http://www.mytripjournal.com/ 
Gridskipper (travel comments, logs): http://gridskipper.com/  
Directions and maps - public transportation by land: http://www.hopstop.com/ 
Driving directions in Europe: http://www.viamichelin.com/viamichelin/int/tpl/hme/MaHomePage.htm 
Seatguru (plane seat selection): http://www.seatguru.com/
Restaurant search: http://www.menupages.com/