I have a

Belkin Bluetooth GPS
ThinkOutside Stowaway Keyboard
Jabra 200 Headset
Motorola HS-810 Headset

The GPS and Keyboard have worked out of the box with the 2100 build BT drivers

The headsets had lots of problems with the 2100 BT drivers. I tried updating to the 2400 Build drivers and it got a little better. I installed the 3100 build drivers available in another thread and the HS-810 seems to connect consistently now. I have not tried the Jabra again with the 3100 build yet.

I have not tried DUN with any of the builds yet.