Business Week came out with a cover story about clickfraud about the time the October issue of Name Monetizer was distributed.  The article described "a thriving click-fraud underground populated by swarms of small-time players, making detection difficult. 'Paid to read' rings with hundreds or thousands of members each, all of them pressing PC mice over and over in living rooms and dens around the world.  In some cases, "clickbot" software generates page hits automatically and anonymously."  

Google and Yahoo reacted quickly and the parking services scurried to cancel the accounts of anyone they believed to be participating in such schemes.   In some cases they told parking companies to cancel certain accounts.  If your account was canceled it does not necessarily mean that you are suspected of clickfraud.  Some accounts may have been canceled simply because of poor "traffic quality."  Businesses who pay for Google and Yahoo ads want visitors to be genuinely interested in their site.  If your traffic never follows-through and makes a purchase then your account may get flagged as "low quality."

GoldKey disqualified some clicks and some accounts in early October as September numbers were analyzed in detail.  They issued the following statement: "Folks: A reminder that our terms and conditions expressly forbid incentive-laced traffic. Specifically: 1.12 Sending any type of incentivized traffic which includes, but is not limited to PTR (Paid to read), PTS (Paid to Surf), and PTC (Paid to Click). If we determine that you are intentionally sending visitors that you know will have no interest at all in our advertisers, we have the right to terminate your account at any time and forfeit your payments."  A similar message appeared on ActiveAudience and I imagine that accounts were deleted there too.  I have heard from several services that the major PPC players share information on who has been caught using click fraud.  In the past it might have been possible to move from service-to-service when you were caught - but this is no longer possible.  (ActiveAudience and GoldKey continue to be highly recommended.)

Remember to never click on your own paid links with any of these services.   These paid links are ads are which are paid for by businesses who want to gain customers for their goods and services.  If we all remember that, then the pay-per-click model will be around for a long time.