Ok, so the Nokia E70 was announced today (link). It has both WiFi and BT. It's a long shot but, is there a way to use it's keyboard for the Nokia 770 via BT?

These kinds of phones appeal to me -- it runs series 60, it's small and it has a built in keyboard.

hmm, I haven't been able to find the BT profiles it supports, but given the look of device I would imagine it cannot be used as a BT keyboard for other devices. Although the Nokia specs says it can have 6 BT connections at once, except with audio BT devices.