Takes all kinds of crazy nut jobs, I guess. Hopefully Twitter has made it easier for guys like Cavendish to get rid of these accounts and shut the impostors down; there have been other recent cases of famous people not being able to shut off the bogus accounts. Here's my thoughts on Twitter if you care to read...
http://www.civilsimian.com/page.php?id=98
http://www.civilsimian.com/page.php?id=98