What I use the Z for:
(*) Syncing (via FTP) and transferring files between work and home.
(*) Viewing some of these files (Excel, HTML, and PDF.)
(*) On-the-go editing of a to do list (I use Zedit for my to do list frankly, I'm a sucker for text editors and this one is nice, definitely my most used program)
(*) On-the-go calculator and contact list.
(*) Remote Internet access; also Internet access at home when I don't want to turn on my behemoth PC, when I want to browse while watching TV, etc.
(*) Storing addresses
(*) Portable calculator
(*) Portable game device
(*) As a device to learn Python on