The new Heinlein autobiography--which might have one of the coolest titles I've ever heard: IN DIALOGUE WITH HIS CENTURY--is due out August 17th. (The day after this editor's birthday. Not hinting or anything. Evil grin.) But in the meantime, you can read some bits about him on Tor.com, in which writers elaborate on their favorite Heinlein novels.
Oh and by the way, this is only Volume ONE. Not sure how many are planned. Probably ten, considering who the book's about, eh?
*via Boing Boing