The folks at the Internet Storm Center (a part of SANS) have released GDIScan.exe, a local machine scanner that will scan your Windows machine for DLL files that are vulnerable to the JPEG vulerability discussed here:
http://www.microsoft.com/technet/security/bulletin/MS04-028.mspx
This is the first scanner for this I have seen, so I thought I would pass the info along.
The scanner is available here:
http://isc.sans.org/gdiscan.php