Several months ago, I asked here if anyone knew of an open source project set up to tackle the click fraud problem. I'm happy to report that there is such a project: ClickSentinel
formatting link
. The community is looking for members and for people to spread the word. (People with Internet security backgrounds would be very useful as they can provide insight into the ways that fraudulent clicks can be generated and how difficult it can be to detect them.) Please visit the web site for more information.--gregbo