Nick and Norah's Infinite Playlist, the amazing book by Rachel Cohn and David Levithan that everyone should go out and read, is being made into a movie starring Michael Cera (of Superbad and Juno fame) and Kat Dennings (from The 40-Year-Old Virgin). The movie comes out in October and more information can be read in this article: http://www.mtv.com/movies/news/articles/1576357/story.jhtml
Nick and Norah is the story of two teenagers who meet at a concert one night, share a kiss, and end up having a whirlwind adventure in Manhattan. The story is told in alternating viewpoints between Nick and Norah (written by David Levithan and Rachel Cohn respectively), and it's just amazing. I highly recommend it. (I'd also recommend Naomi and Ely's No Kiss List which is also written by Levithan and Cohn. It's not a sequel to Nick and Norah and not quite as amazing, but still great.)
I'm not sure how I feel about the upcoming movie, but that's my general reaction to all movies based on books these days. After massacring some of my absolute favorites (Ella Enchanted and Blood and Chocolate, to name the two big ones), I've kind of given up on Hollywood being able to do a good book adaptation.
A couple of other movies coming out in the near future that are based on books are Twilight (by Stephenie Meyer), and The Time Traveler's Wife (by Audrey Niffenneger), both of which are excellent and highly recommended books. Fingers crossed for the movies, though. I guess we'll just have to wait and see what happens.