The new Steve Jobs biography by award winning author Walter Isaacson is on sale now.
Available on iBooks (of course):
iTunes - Books - Steve Jobs by Walter Isaacson
As well as Kindle, Audiobook and Hard Cover
Mr. Isaacson began working on the only biography authorized by Steve in 2009 and last interviewed him three weeks before he passed away.
NOTE: Apparently some early iBooks copies of the biography didn't work properly for a few folks.
If you had trouble with yours Apple recommends deleting the iBook from your iDevice and downloading it again...no charge.