I was going to mention the N900 too. The curved keys of the N900 had a really nice feedback, allowed fast typing, and the shape helped navigating with the fingers on the keyboard blindly. I am quite happy that the keys are curved on the Livermorium, though flat keys shouldn't be an issue either on a keyboard larger than that of the N900.

On a different topic, I seem to remember that RGB LED had been confirmed, but I am not sure anymore and cannot find the information anymore. Did I dream it? I like FMTX/RX and IRDA (which I'm 99% sure will not happen), but RGB LED for notifications really is a life changer for daily use.