SEC finally got him. Always thought his whole Sharesleuth.com endeavor was a red flag that he was up to some pretty questionable things. I guess some others thought the same...
http://money.cnn.com/2008/11/17/news/newsmakers/cuban_insider_trading/index.htm?postversion=2008111711
http://money.cnn.com/2008/11/17/news/newsmakers/cuban_insider_trading/index.htm?postversion=2008111711