Worried about the WMF vulnerability. Secure Enterprise Magazine's Editor Mike Fratto has found two 'off the record' fixes that will do a good job of holding down the fort until Microsoft comes up with something more official. Mike explains:

While I am not in the habit of recommending unofficial patches, it seems like the WMF vulnerability is pretty nasty, so you probably want to spend some time testing and deploying the work-arounds. Simply blocking files ending in .wmf won't be enough because Windows handles WMF files based on file structure, not extension. Files ending in .jpg and .gif are just as likely to be WMF files as not.