Our goal this year (besides starting production of the new Mini) is to create a prototype of a keyboard with transparent keys overlayed on a single display. Production should start later this year, or in the beginning if 2009.
First real thing will most probably be based on a TFT-display. Hopefully, this full-color keyboard will retail for under U$800.
Then, as technology advances, we'll hopefully lay our hands on a e-paper display (they promise double-sized displays in May). This will allow us to design a lightweight, wireless keyboard (but a bit slow).