After some sober thought... I don't think what I was envisioning would work.

I was thinking about trying use a PBAP device to control a piece of software totally unrelated to the address book. I think maybe a better choice would be to rig up a bluetooth enabled SPP device to some buttons and switches. Everybody supports SPP.

Edit: Or what about AVRCP? Stupid idea but let's say I'm in my car driving along with Maemo mapper running on my N800 on the dash and my Jabra BT620S headphones on. Could Maemo mapper be hacked so that the music controls on my headphones zoom maemo mapper in and out?

David