Yes... well sort of. I downloaded BlogML from its SVN repo (http://www.codeplex.com/BlogML). I chose the version that works with Community Server 2008.5 (its an older version, 2.0 I think). I then added the code to my solution and added the TC5 DLLs for references instead of the CS 2008.5 DLLs. There were several areas where the C# client API changed from CS2008.5 to TC5 so I had to fix a few method calls to some webservices since the signatures changed. Once I did that, I compiled BlogML and it worked.