Well...I don't have a firm spec, or any spec. Just experimenting to see what's possible and get a stronger grip on what I can do with it, and I figured some samples would give me a general idea of where to start. I definitely want to set up a PAN controller if possible, though.
I do have a question right now: Can a Mote mesh with an XBee if they're both on the same frequency? I know they both implement 802.15.4, but I don't (currently) know enough about that protocol to know if that's a strong enough constraint to allow them to connect. If not, I might experiment with physically connecting an XBee with a Mote to build a bridge between the two networks.