Kawasaki's latest book, Reality Check: The Irreverent Guide to Outsmarting, Outmanaging, and Outmarketing Your Competition
He's a really interesting guy with some pretty sound advice. I follow his blog from time to time. I'll always remember this post from a few years back outlining twelve tips on being an Effective Emailer. I receive a lot of email, and there are a lot of people out there who could benefit from reading that post. I'm just saying.