I dont usually plug other products, but I just bought a retro bluetooth handset, and I love it. retro handset
The amazing thing is, by 2.5 year old son, who has never really said more than a few words on a phone before, took it and had a complete conversation with his granny! I was stunned. The retro handset is just the natural way a phone should be! It's just more natural.
To stay on topic, this thing works great on my Openmoko phone running Qtopia!