I just Googled this phrase to find out for myself, and came upon the following handy tool:
http://www.selfseo.com/google_ban_tool.php
As it turns out, I’m not banned! Although I don’t know why I would be, since my site came up in the search results in the first place.
If you did find your site was banned, I suggest you get yourself to a search engine optimization specialist who can do an analysis of your site and find out whether the problem is duplicate content, keyword stuffing, or what.