Let's hope this post will be found by anyone having problems with USB Bluetooth dongle under Linux. I bought "Sweex LE000010" model which seems to identify itself as "Broadcom 2035" (lsusb id 0a5c:200a). I knew it probably won't be easy to work with it under Linux but I had more significant problem - I was not able to communicate with the device at all (allthough it was detected).
After several hours, when I was getting really desperate I found the solution: The dongle has to be plugged directly into the computer, not into the USB hub!!!!!! I have no idea why but it's true. When I plugged it directly into the PC, it immediately started working without me having to configure anything (btw: The defauld PID for synchronization with the PC is "1234").
Now for the second part of problem: Does anyone know how to configure Nokia 6681 to connect to the internet through my Bluetooth/enabled PC? (Not connecting my PC to the Internet through the Nokia - the other way around!)