Kirk E, any recommendation on getting this to work with WIndows Server 2008? STSDEV was causing me trouble as well. I've tried the whole Run As Administrator thing. Still researching, but let me know if you have heard of any tips/tricks.
--- Update ---
Nevermind, I figured it out. The release notes held the key, but I couldn't simply take the provided app pool owner and put it in the Administrators group. Instead I had to create a new application pool and make sure it was in all the right groups.
I'll try to add more details soon in a wiki/blog.