SusanB wrote in today to tell us about a really good write-up on understanding Microsoft’s KB971492 IIS5/IIS6 WebDAV vulnerability by Steve Friedl of is available here.
http://unixwiz.net/techtips/ms971492-webdav-vuln.html
This was written because Steve and some of others at unixwiz.net found Microsoft’s "guidance confusing for users who were not IIS experts".  This includes a very good flowchart that should assist anyone who is confused, detailed descriptions of WebDAV, remediation ideas, and links to other WebDAV references.