LTSP = Linux Terminal Server Project (www.ltsp.org). It's a bunch of scripts and such to allow completely diskless computers to boot Linux from a central server. It's designed to be flashed into the BIOS of the network card in a generic PC, but has been adapted to boot from the IOpener as well.
It was pretty trivial to get working with a server with RedHat 7.1 and flashing clients was as easy as sticking on a temp hard drive and uncompressing the boot image to the IO's flash disk.
The big advantage is you end up with a totally silent workstation with as much virtual storage as you want that acts just like it's right there. As someone who keeps an IO on the bedstand, the whine of the laptop HD was getting on my nerves.
Now if I could get wireless working, I could put the other units pretty much anywhere there's power without needing to run CAT5 all over the dang place.