From experience, a mailing-list works out better even for a small number of participants, 'cause communication is just a tiny little bit smoother when you don't have to remember who to email already. But then, I do admittedly tend to be a bit too obsessive about details. :)

I've been peeking into the Trac and, uh, pondering rigging up a script to extract the sources from its Web interface so I could toy around with it, but that was still on my pile of stuff to do. It'll be easier with Mercurial access, anyway. :)