Did you use adlogger to monitor your clicks? Someone must have click bombed your site.. (several clicks from 1 IP address)
You can try to appeal if you can prove that you weren't the cause of these clicks.. OR look for an adsense alternative to use on your site. It's not the end of the world.
Appeal and give them all your stats and ask if they want anything else. And some people earn more on CJ than adsense.
Move on and find another ad network. There are very slim chances that you'll be accepted back into Adsense.
How many of these 'mistakes' did you make? As for alternatives, Kontera has been great for me. Yahoo CAN be very good also, depending on the niche of your site. On a few of my pages Yahoo does way better than Adsense, but on the majority of pages Yahoo sucks.. Just depends on the subject..
That's AdSense ... they don't care about small publishers enough to give them a chance to present their case most likely you won't get your account back
www.ask.com will be launching a CPC network within the next week or so If you cannot get your account back by appealing, I suggest giving it a shot.
i'm sad for you. have you tried to contact google with the proof of that you did not create any invalid click/or imp.? and using adlogger is a good suggest