Check this little tool out.. IISLock down..

http://www.microsoft.com/Downloads/Release.asp?ReleaseID=32362

I just installed it on a server with 300 domains and 0 problems. Works great and may help slow down code red and other IIS Virus's.

It can disable .ida .htr and a ton of others does some other really cool stuff to help out IIS as well.. :)

Aloha
Mahalos for the link looks cool ;)
man if this is new why not earlier ;) MS
heheheh