Currently, only Bluetooth mobile phones and Palm handhelds work with mac bluetooth, but BT is still in it's early stages on the mac, and I'm sure Apple are holding out on BT input devices until they have their own BT keyboard and mouse ready to roll. Anyway, if you still want Bluetooth for a PDA or phone, I'm not sure what the situation is on PCMCIA Bluetooth. But if you have run out of USB ports, try looking for a 2 or 4 port unpowered USB hub. I'm pretty sure there are some which are basically a big plug with 1 USB in and 2 or 4 USB out, so that you don't have the little bit of cable hanging off the side of your PB.