This, to me, looks like fun:
Rotor Whidbey fun - building and running on Longhorn
Just thought I'd post a small screenshot of Rotor Whidbey running on a Longhorn build - we speculated if it'd even build, but as it turns out, coupled with the latest Whidbey C++ compiler it built and ran fine. As a side tidbit, we've got daily tarballs being generated from the latest CLR source check-ins - however sometimes we experience a bit of lag, trying to update the CLR source to be cross platform friendly.
Can't wait to get my hands on Rotor Whidbey!