I decided to configure a new Linux machine just for photography. I just bought LightZone for Linux, and plan to move all my images over to this new machine and set it up just for photo editing.
I did a fresh install of 64-bit desktop Ubuntu 8.04 (Hardy Heron), followed by an install of the nVidia restricted drivers. Everything went flawlessly.
Attempting to run LightZone resulted in:
Preparing JRE ...
./LightZone: 148: bin/unpack200: not found
Error unpacking jar files. Aborting.
You might need administrative priviledges for this operation.
Turns out if you're running the 64 bit version of Linux, you also need one additional package which can be installed with Synaptic, the default package manager:
Those are the 32 bit compatibility libraries for the 64 bit Linux. After installing them, everything went swimmingly.