You know that Bluetooth chip in the iPhone is capable of doing wonderous things, right? It is able to do A2DP stereo wireless and EDR Bluetooth file transfers. For some reason (battery?) Apple has decided to leave these features out of the software.
Never fear, MeDevil has found a way around Apple software limitations and is building a hack that will allow file transfers called iBluetooth. It will be in your Cydia iSpazio repository "soon".