, which could be instantly configured to display either a standard phone keyboard or a Treo-like qwerty set-up. The lack of hardware feeling in your fingers also can be solved by pairing the e-ink "screen" with vibration queues whenever you click on a virtual key.
The use of e-ink technology allows this solution to save battery life while the keyboard could display keyboard set-ups for various regional markets, like Russian, Chinese, Spanish, etc. Illumination of the individual virtual keys is the only tricky part, but I guess the technology could be tweaked a bit to allow the active dots to be transparent or translucent enough to allow baklight to pass through.
Moreover, this keyboard area could be used as a battery saving second front screen, to display not-so-dynamic data as battery status, time, network strenght, missed cales etc.
Even an upper extension of this e-ink screen or a third smaller e-ink screen above this one could be used to display a variable navigation keys, which could switch to a music player set-up. This way, there is no need for dedicated media keyboards like the one featured in the Nokia N95.