Reporting Paid Links To Google

If you ever wanted to report a paid link to Google, but didn't know how - you can easily as they've added a nice form to inform them of a guideline flounderer! oooh where do I start?

Luckily enough I've never bought or sold links, but of course I have treaded that very thin line, and occassionaly camped on the other side, but hey we all make "mistakes"!

But it would be interesting to know how big a problem they feel it is to actually create a form for it!!