Here are the things which I use to keep my Adwords campaigns in line. They have worked well over the last year as I have increased my company's revenue ~10 fold and have been able to hold a consistent ROI over the course of that increase.

Here are two services which offer heat-mapping services for  your websites at a variety of price ranges. I have been using Crazyegg.com now for several months on multiple projects and since there was no other comprable service that I was aware of, it suited my needs, though apparently now there are others, such as ClickTwist.com as pointed out by Mark (thanks Mark!) which I will have to give ...

This page gives an in depth look at the various aspects of and current issues regarding Google and click fraud. Link: http://www.marketingpilgrim.com/index.php?tag=click-fraud