The winners are chosen by public vote and you can even do a write in vote if your favorite isn't listed.
See my reviews of shortlisted titles:
Across the Universe by Beth Revis
22 Britannia Road by Amanda Hodgkinson
The Peach Keeper by Sarah Addison Allen
My write in vote for Favorite Book: Forbidden by Ted Dekker and Tosca Lee
Now go vote for yours!
Vote now for your favorite books!