YAKUMO Bluetooth 2.0 Bluetooth Dongle Adapter BlueportPRO (Personal Computers)
I was looking for some time a bluetooth key running Linux, here's one! Tested on Ubuntu 6.10 and 7.04, as well as Fedora Core 6 and Centos 5, this key gave me hassle to transfer files with my phone (other devices are compatible but I have not tested)
