Hostelworld has launched a new Facebook App called Route Planner:
http://apps.facebook.com/hostelworld/

...the Hostelworld Route Planner puts the world of travel at your fingertips! Plan your route, search and book hostels, store your bookings, check out reviews for over 15,000 hostels worldwide, share your trips with friends and travel companions...
The full press release is here:
http://www.webresint.com/pressrelease.php?PressID=608