The more i thought about it the more I thought it looked like an Easy Out. insted of a drill bit. To use an easy out, drill a hole into the bolt you broke off, and you screw the easy out counteclockwise into the hole, eventually, hopefully the bolt starts comming out. I googled Easy Out, and found this bizzare page on Ebay that wouldn't load for me.
http://cgi.ebay.com/NEW-EASY-OUT-BES...QQcmdZViewItem