Recently (9/3/2010) a new worm called Worm:Win32/Visal.B was spotted in the wild. As an IT Pro, you know that you must move aggressively and early on this kind of security risk information, or regret it later.
Microsoft Malware Protection Center Threat Research & Response Blog is a great resource, and covered the issue and technical background 13 hours ago.
You can also read about it in the Malware Threat Encyclopedia.
All well and good, but wouldn’t it be great if there was a place where everyone could share detailed technical information on what you actually have to DO about this threat?
Now there is such a place. See http://social.technet.microsoft.com/wiki/contents/articles/worm-win32-visal-b.aspx.