Any Good PPC Resources Out There?

I need to read up on Adwords and PPC in general. Because I've been out of this game for a longer period of time. Does anyone have any recommended reading? And most importantly, something that's recent?

Hopefully someone can help me out here.

Thanks for your reply. But that is not what I am looking for right now.

I have been out of the adwords game for about a year now. And in the meantime a lot has changed. I am looking for some guide that is up-to-date on the latest changes which I can read. Other then their own guidelines of course.