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It's a broken mess, and it dosen't look like MS is going to fix it anytime soon. Had USB support been the same on Windows, I could see similar disasters.

Bumping this back up, as it looks like SP2 fixes the Bluetooth issue. I got a Dell Inspiron 9100 recently with a Bluetooth option. I did a fresh install of XP Pro with SP2 slipstreamed, and it simply detected the module wiith no additional drivers. I then bought a Logitech Bluetooth keyboard and mouse, and used the Bluetooth control panel to pair them.

Still not quite as good as the Mac Bluetooth experience, but much better then the horror stories of old.