I have read almost every adwords ebook there is. My favorites are Perry Marshalls, Adwords Miracles, and Beating Adwords. Let me know if you have any questions. I've been making a living using PPC for two years now.
no books are substitute for real life experience there is enough information on google web site to get you started
I really enjoyed the Perry Marshal's Ultimate Guide to Google Adwords. The book could have been a bit shorter , but anyway there are plenty of interesting ideas in it.