Windows NT/2000 source code leaked?
I haven't seen anything approaching solid confirmation of this rumor yet, but multiple sites including NeoWin (which is hammered) and HardwareHell have some info about some Windows source code packages apparently circulating around the Internet. The biggest immediate concern, of course, is the possibility that people could find serious, undocumented security holes in these operating systems and exploit them in various bad ways. We'll be watching this one to see what develops.
Update: Microsoft has confirmed the code leak, although they are saying the leaked code is "incomplete."