faster/less intuitive text inputs into the cellphone
Morse code has had way over a century to evolve. It has a steep
learning curve but after you get over the hump it's second nature.
Cellphone text inputs have had only a few years to evolve. I
believe that the optimal user interface will look nothing like
today's interfaces (except maybe in "newbie doesn't know how to
use it yet" mode.)
Creeping Featuritis probably will slow the process down. Look
at a modern DVD player remote control to see how Featuritis can
turn from Creeping to Exploding - most DVD remotes have well
over 100 buttons!
Tim.