Weather sites:

• NBC Weather
• News, weather and travel  (requires free registration)
• The Weather Channel

News and Information:

• The New York Times  (requires free registration)
• USA Today
• The Wall Street Journal

Hotel Reservations:

• Reservations for   Choice Hotels   (Clarion, Comfort Inn, EconoLodge etc)
  
• Major Hotels

General Travel Sites:

• Subway Systems   in cities across the world
  
• Cities across the World
• MapQuest
• Rubicon Digital Passport     Site for international travels, currency exchange rates, time sones, airport guides etc
  
• Travelocity     Lists attractions, restaurants and hotels around the world

Airlines:

• American Airlines   Only site that lets you check the status of a flight in the air
  
• British Airways
• Delta Airlines
• Continental Airlines
• TWA Airlines
• United Airlines
• USAir Airlines