Guys, I'm not so experianced in SEO but I have got on my account $25000 (I don't mistake....there are three zeros)... I have a simple, quite simple site about SEO (http://jimsmarketing.blogspot.com)without any PR. But one day my account had increased to $25032...there was just $32my honestly earned bucks...What's more $25000 I have cashed in real money so far....How can it be?
Well if you have all of a sudden gotten so much money you should be very concerned about your adsense account (provided that is what you are talking about) because google will most likely say it as fraudulant clicks and ban you. So I would notify them as soon as possible if you want your account to remain in good standing.