ComeBack by Claire and Mia Fontaine, whom I interviewed last year, is out on paperback and is the Target Bookmarked Club Pick for Winter 2007.
Though it's been blogged about many times and many ways, Miranda July has the coolest book site ever.
Also not exactly a secret: Lethem has a new novel, You Don't Love Me Yet. It's about art-rockers. (See Birnbaum interview with JL.)
And: New Yorker fiction editor Ben Greenman's A Circle is a Balloon and Compass Both looks like a good one.
Last but not least, the Vietnamese monk Thich Nhat Hanh always has enlightening stuff to say. His For a Future to be Possible: Buddhist Ethics for Everyday Life, published in February, is worth checking out.