I do have access to several of the environments you'd like to test on,
including Mac OS X, Linux, and AIX. I'd be more than happy to do some
testing on those platforms.
I'd also like to get more involved in BUP in any capacity. In my current
position, I'm the resident 'process geek'. We're currently in the middle
of a large project using the RUP process and toolset, but this project is
the exception - usually we develop in smaller teams, with smaller budgets
and less ceremony than the RUP calls for. Needless to say, it sounds like
the BUP fits in perfectly with our needs. I don't think we're unique in
that aspect, either.