BuddyPress.org

I need to do something similar. I have two domains (sunysb.net and sbulife.com) where sunysb.net is the domain I use for buddypress, and sbulife.com redirects to it. Normally, I would park sbulife.com on sunysb.net and the end user wouldn’t know the difference, but with the subdomain rewrite rules, it really screws up wordpress mu.