I found this one kind of striking.

http://www.motorola.com/mediacenter/news/d...6325_23,00.html

didnt docomo come up with something similar? or was it just an embedded RFID chip in the case?

you may want to take a look at this tho:
http://wired.com/news/technology/0,70167-0...?tw=wn_index_13

i find the thinking in it reasonable, and may explain why a service like that motorola pushes will ultimatly fail...

edit:
found this over on arstechnica (and yes, i talks a bit about the m-wallet from motorola at the end):
http://arstechnica.com/news.ars/post/20060...60209-6149.html