This illustrates just how vulnerable unpatched PC's are. With no user intervention whatsover, an insufficiently protected machine was hacked in just a few minutes.
Own3d in 200 seconds,
Unprotected PC's can be hijacked in minutes
For those of you with Windows XP, upgrade to Service Pack 2 - you will be a lot better protected. And if you don't have a firewall installed, now is the time to get one.