Cheap Flight and Hotel Deals:
Urlaubspiraten, Urlaubsguru and Flynder offer really cheap Flight deals – you have to be flexible about location and dates, but seen Berlin to Shanghai for 83 EUR (return) and 75 EUR return flights to New York.
LTUR for last minute trains.
BlaBlaCar (car sharing around Europe)
Waymate is a search aggregator for trains, cars, buses and planes
GoEuro is another good european search aggregator for cars, planes and buses.