I mistakenly believed that the Com One Bluetooth Oneboard would probably be compatible with the Treo 680. Testing it with the latest drivers proved me wrong : no communication between the Treo and the Keyboard was ever achieved, and exiting the driver’s control panel reliably triggered a reboot.
Apparently, the iGo Stowaway is also incompatible with the Treo 680. Some further research showed that although there are plenty of Bluetooth keyboards available for the Treo 650, but none of them is sold as compatible with the Treo 680 in spite of how similar the two phones are. I would guess that the Bluetooth stacks differ enough to be a problem.
Even if there are significant hurdles that hamper porting Bluetooth keyboard drivers to the Treo 680, I am very surprised that the manufacturers have dropped the ball in such way. I would guess that the consumers are not the only ones losing patience with Palm, and that the vendors are now starting to abandon ship.
Anyway, I’ll probably have to buy another infrared keyboard to replace the Think Outside infrared keyboard I killed by over-use…