Samsung SGH-i500 / SGH-i505
Bluetooth expansion cards
Seems like on some of the older smartphones phones you could slip in a card and it would enable dial-up networking via bluetooth, but you could not use a bluetooth headset.
It'd also be nice if it'd be compatible with iSync.
Lots of nice Samsung Smartphones coming to market... too bad they are lacking this feature. But if an expansion card would work, that would be great. If not, it'd still be a great second phone for times you aren't going to have a laptop with you anyway.