Airbnb - Book unique places to stay and things to do.
HotelTonight Escape - The best getaway deals for tonight (or the weekend)
HomeToGo - HomeToGo is a search engine for vacation rentals worldwide.
Hotellook - Compare hotel deals from all the leading booking agencies
FlatMateMe - FlatMateMe uses Facebook friends and interests to help people looking for rooms and roommates.
MakCorps - Hotel Price Comparison API