NUnit for Team Build
please have a look to this codeplex project : "NUnit for Team Build"
This project is adding support for NUnit to TFS 2008's Team Build so that your NUnit test results are visible in the build log and incorporated into the data warehouse for reporting.
Team Foundation server is for all the development teams (regardless if you are using Microsoft or non Microsoft technologies and quality tools)
For more information, please contact Richard on his blog : http://richardsbraindump.blogspot.com/