I don't really keep up what the hottest releases are, but I do keep a running list of books I've had recommended to me that I want to read. Currently the list includes:

The Accidental Creative, by Todd Henry
Real Time Marketing and PR, by David Scott
Getting Things Done, by David Allen
The Secret Life of Pronouns: What Our Words Say About Us, by James W. Pennebaker
Teaching as a Subversive Activity, by Neil Postman
The Wisdom of Crowds, by James Surowiecki
The Time Paradox, by Philip Zimbardo and John Boyd
How We Decide, by Jonah Lehrer
Principles of Applied Stupidity, by Justin Locke (after catching his excellent Google talk video)
The Upside of Irrationality, by Dan Ariely. Dan Ariely's Predictably Irrational was the most influential book for me I read in '11 and I think all serious Internet marketers should read it and consider it's implications.

Wade