Hex blog: WMF Vulnerability Checker
Attention, WINDOWS users. All hell is about to break loose. Basically there's a possibility of using mages to run a malicious program. You can get infected by just browsing a bad site, or by getting images in Email, or Instant messenger service or howsover you get images. Please go to the link and check if your computer is vulnerbale. Also there's a temperory fix available there (from the link). Do it NOW! This affects ALL versions of Windows, irrespective of browser/ antivirus software et al (any doubts,leave a comment or see the Wikipedia entry on this virus)
UPDATE: Microsoft has issued a patch.