Java based wireless applications.

With the popularity of the Wireless Internet Messaging technologies as discussed by Puneet Gupta in his latest article on Wireless Technology at TechRepublic.com [Online#3.13787.65-nAzEsGrtd798RRRR.1@newsletter.online.com]
I’m interested in anyonesthoughts on off-line data capture, store (in the cell unit) and forward (on demand) to a host. Are there any killer apps waiting to be developed? Is it a feature no one wants.. etc…