Salling Clicker is an application that allows you to use your mobile phone or PDA as a remote to control media software on Mac and Win. I believe it allows data transmission through both Bluetooth and WiFi -- and possibly IrDA on newer Macs with FrontRow.
Using Salling Clicker as a "base" on the desktop, would it be possible to use the Zaurus as a remote? Unfortunately, it costs. But there's also free "
Remote Basics" software for the Sony Ericsson x700 that gives that device full access to the Mac's primary media apps. Maybe this could be tweaked to support the Z?
What I want, really, is the ability to at least pause movies playing in Quicktime or VLC without having to walk across the room and without the huge battery drain of running VNC on my Z. Maybe this is already possible, and I just don't know.