Reports are sketchy, but it seems that
Tradehill, a
Bitcoin exchange, has recently been compromised. If you did not know, Bitcoin is a virtual currency. It's completely electronic and not backed by anything. That is to say, all records are kept electronically, and each Bitcoin is only worth what other people are willing to pay for it. As a non physical currency, it is vulnerable to hacking.
Read more at:
TheVerge
SiliconAngle