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: http://www.snort.org/vrt/advisories/2009/07/28/vrt-rules-2009-07-28.html
Sourcefire 3D customers can get SEU 250 with these rules in it.