Pay Per Click Reports

Google Cash by Chris Carpenter
Lots of good ideas. I especially liked his section on copy writing and recommend it to everyone just trying to sell things for the first time.

21 Ways to Maximize Your ROI by Andrew Goodman

AdWord Analyzer

Mastering AdWords

Who's Clicking Who?

Detect and Deter Fraudulent Clicks

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Make Money on Google

Earn extra cash in your spare time on Google with this easy home-based business. If you love the Internet you can easily use search engines to make money in your spare time. They even offer a FREE e-course to get you started!