Here is a VERY basic but VERY informative and FREE guide to
PPC for Newbie Affiliates.
Before you spend money on some crappy ebook 
read this!
Adwords PPC For Beginners
Some affiliates are increasingly turning to paid search to provide the traffic they require to generate revenue. This guide should give you the basics you need to make some informed decisions about how you might be able to carve out a niche for yourself in this often highly competitive area."
EASY, TO THE POINT & FREE
UK Affiliate Marketing Blog » Adwords PPC For Beginners
I've seen some other GREAT free info about PPC, I'll find and add here.
If you guys find any good blogs or guides, please add to this thread.
(Please don't link out to your site - in-depth PPC resouces only.)