What i'm planning on doing with the handheld:
taking notes and quickly adding items to a "to do list"
syncing with MS office (outlook, excel)
i'd like a camera on the PDA, both of which the above have.. the z72 seems to have a stronger one?
also.. i'd like to be able to play games on the handheld, and from what I gather, the z72 seems to have a processor better suited for gaming.
Both units can do PIM (contacts, calendar, to-do, memo) very well and both come with software that allow your handheld to sync with Outlook.
The camera on the Zire 72 has higher mega pixel 1.2 vs. .31 on the Sony. For gaming, the Zire 72's d-pad is much better than the TJ's scrolling wheel.