trisoft can get hold of 6000 batteries at a not-insane price.
there's been some recent activity in Angstrom for Tosa, so the device isn't a dead duck.
when I get my act together and create an installer for TomTom to allow you to put in your TomTom x00 sd card into the Z and use the Z as a sat-nav, the 6000 might have a new lease of life.
the 6000 would also make a neat multimedia controller/player in your car, get a wifi enabled hard drive (Asus WLL-2.5R or Dlink GDSM600 thin) put in the boot of your car, SMB mount it and play MP3s via the zaurus!