For those of you that use MS ISA as a proxy, or even as a perimiter protective mechanism, Microsoft has posted an article on "Learn How Your ISA Server Helps Block VML Vulnerability Traffic (925568)"
This would be highly recommended measure in a Microsoft centric environment, as one of the defence-in-depth layers of protection, not by itself. Please see the earlier diary entries on the VML vulnerability and its current exploitation here.

Cheers,
Adrien de Beaupré
Cinnabar Networks/BSSI