So, today, Microsoft released an out of band patch, two issue, one for Internet Explorer...

Microsoft Security Advisory (MS09-034):
Microsoft Internet Explorer contains programming errors that may allow a remote attacker to execute code on a vulnerable system.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 3, SIDs 15731 through 15733.

Advisory is here:

Sourcefire 3D customers can get SEU 250 with these rules in it.