Japan Media Review has started a Keitai Log:

an occasional Web diary by a group of Tokyo college students who are researching the changing role of cell phones -- keitai -- in Japanese society. Check in every week for new musings from our keitai team reporting in from the wireless capital of the world.

In Japan nearly everyone has a cell phone and there is evidence that young people particularly are more literate with cell phones than computers.

...via Gizmodo