Naomi and Ely's No Kiss List by Rachel Cohn and David Levithan
Naomi and Ely grew up across the hall from each other in a NYC apartment building, and they're best friends for life...until Ely kisses Naomi's boyfriend and means it...then all bets are off.
I wasn't looking forward to this book at all, since I was NOT a fan of the earlier collaboration of these two authors, Nick and Norah's Infinite Playlist. I was a bit pleasantly surprised by this book, which is an interesting take on the evolution of a friendship, although it read a bit like fantasy masquerading as realistic fiction. There are some real gems of truth in this tale, though, so even though it's not the best I've read, I'm going to say MAYBE and wait to see what others think.