Bluetooth devices advertise services such as hands free, information exchange, file transfer etc. Some of these services only work in one direction e.g. phone to stereo headset.
You'll need to establish what services are available and work round some of the limitations. I've found that sometimes the only way of transferring data is to either swap memory cards or use a PC between the devices. (the PC option is sometimes the only way).
The bluetooth stack on the streak is better than other Android 1.6 devices, tweaked by Dell no doubt. FROYO, if thats what we are going to get, should improve things again.