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I've been Reinstated - Adsense has let me Back in
A member recounts their experience at being removed from the AdSense program, but subesequently reinstated when she proved that she was not responsible for false clicks.
What to Do When You are Kicked Out of Adsense
A long step-by-action-step tutorial on your recourse when booted from AdSense
There's not much we can do here to diagnose why you were banned. If you read the above posts you should get a good idea of how to proceed in getting reinstated if you feel you did not break any rules. And make sure you know the rules. ;)