Bluetooth has a 7 device limit per transceiver.
I'd forget about bluetooth printing. While I've seen some BT-enabled print servers, I can't imagine trying to print, say, a color photo. S-L-O-W.
Some BT transceivers are better for distance than others, though I haven't really looked in to this much so I can't tell you more than that. I can tell you that I can sync/access my Motorola RAZR V3 phone from my Mac even when the phone is a good 25 feet away. Couldn't do this with my previous SonyEricsson T637, so YMMV.