I have started a project called Quantix which is also on SourceForge.net. Both xMach and Quantix have not had particularly high amounts of page views. I think collaboration might not be a bad idea.
I really don't know a whole lot of programming. I know a good amount of C, that's just about it.
xMach seems like a great kernel. I'm currently in the process of looking it over myself.
Perhaps we should consider working together?