just this forum is enough to give you a lot of people who got banned from Google, and the latest Google+ is also something that is making lot of noise for google banning people. the noise was so loud that Google has responded yesterday for google+ account suspension.
Go to the link and contact their support if you think you haven't done any wrong and are following Google Adsense policies google.com/adsense/support/bin/request.py?
How did you get banned? Clicking on your own ads? If you can no longer use AdSense as a source of income, I would suggest switching to affiliate ads using affiliate marketing.