The Keitai log is a web diary by a group of Tokyo college students who are researching the changing role of cell phones in Japanese society. This post discusses thing mobile phones can not do now, but would be part of a "wish list".

The interesting bits:

Adjusting according to the atmosphere (environment)

Recharge-free

Responding to an owner's mood

Interesting read, and other topics are covered there too, like reactions to mobile phone camera, good manners, etc.