Really, Netmeg? Do you just leave your ads on the site? How many click bombs did you receive yesterday? Since when did yours started? Mine since march 4.
I first noticed sometime in October.
Yesterday? About 925 clicks on a channel/placement that normally this time of year would get a tenth of that. Most days the clicks are gone by the next day, but yesterday's are still showing, so they'll be taken off at the end of the month. So my reports for this month are already hosed.
The reason I leave them up NOW is because it's happening to you, too. Well not you specifically, but the fact that so many are experiencing the same thing at the same time tells me my account is now probably as safe as it could be under the circumstances. If it were *just* me, then yes, I'd take the ads off again in a heartbeat. But I've been prowling the Google forum, WebmasterWorld, the AdSense Publishers Panel, and even the private AdSense forums that nobody talks about, and it's happening everywhere. In this case, there's safety in crowds.
And also, I don't know at this point if these clicks are real, or there's just some weird reporting glitch going on. I have Google Analytics, Piwik Analytics, StatCounter and raw log files, and I've gone over them all with a fine tooth comb - none of this behavior shows up there.
So at this point, I've exhausted my options and the ball is in Google's court.