On line travel services:

• Expedia Flights, Hotels, Vacations, Cruises, Cars
• Travelocity Flights, Hotels and Vacations
• Orbitz Travel deals
• Priceline Flights, Hotels and Cars
• Hotwire: Find airline, hotel and rental car deals
• TravelZoo: Search Across Multiple Airline Sites for Low Fares
• BizRate: Bargain prices for Online Travel
• CheapFlights: Discount airfare deals
• Eurail: Book your Eurail pass or Eurailticket
• AirGorilla: Online travel tickets with SuperSaver airfares
• Bookingwiz: Compare fares on all major travel sites
• Lastminute: Book flights and hotels together
• Qixo: Search multiple airfare sites at the same time
• Travel.Com: Worldwide travel reservations, fairly extensive site

Travel and country guides:

• Fodor's: Online travel guides including hotels, restaurants, museums, sights, sports, bars etc.
• Frommer's: Travel guides, budget car rentals, money-saving advice, written by experts.
• TravelNotes: Travel directory on which providers advertize