Travel links

• Currency exchange
  
  
• Maps
  
  
• Yapta.com (price tracker)
• AirNinja.com
• Lowestfare.com
• Cheaptickets.com
• Yahoo!Travel (flights)
• Northwest Airlines
• United airlines  
  
  
• HotelNinja.com (independent hotels, B&Bs)
• Hoteldiscount.com
• GORP travel (hotels etc.)
• National Car Rental 
• Sixt Rent a Car 
  
  
• Amtrak
  
  
• Travel in Europe (air, rail, cars, hotels)
• Deutsche Bahn
• European Railpasses