just type: site:
www.yourdomain.com in google, and if you don't see your domain, it may be you're banned...also just
www.yourdomain.com in search should display your domain there if you're not banned
And another thing is pagerank toolbar, if it's gray, it means you are banned, if it however shows only 0/10 it doesn't mean you're banned, but just w/o pr ;)
Hope it helps...
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