Installed BT3b to HDD along with XP and Ubuntu. At first the sound wouldn't work, but I fixed that by re/installing latest ALSA and unmuting the surround channel in alsamixer. Some extra steps were needed to make the system remember the volume settings on reboot, as it used to forget them.
Also, the hard disk seems to fail to shutdown properly on poweroff, but shuts down fine on reboot. I am still looking for a fix.
Everything else seems to work.