When the SEC charges someone with insider trading or any other crime, most lawyers will advise them that the best course of action is usually to keep their mouth shut and fight it in court. But some people just can't help themselves. Martha Stewart, for instance, tried to fight her insider trading case in the court of public opinion, and it didn't do her much good. Now another high-profile billionaire, Mark Cuban, is in the SEC's sights . He knows that from a legal standpoint he should save his arguments for the judge, but he just can't help himself. Cuban is fighting this case on his blog. Or rather, he is letting his lawyers fight the case publicly on his behalf by printing their memos on his blog.