I'm now running a Ubuntu ... (20 May 2008)
I'm now running a Ubuntu based laptop with a somewhat functions Obsfucated TCP patch in its kernel. (If you have a Neo like view of the Internets you'll be able to see it by the funny options in the SYN packets.)
Hopefully soon I'll be able to post a first draft patch for other people to try. In the mean time, I wrote the start of the mounds of documentation I suspect it'll need: a very non-technical introduction.