I have been asked about the whereabouts of the tkcrom 2.0 files, since OESF/ZUG downloads don't work! ( admins please note)
I found this site
which is a website with some useful help in using GPS cf cards on the zaurus.
The writer used the tkcrom 2.0 alpha and home on sd script with a 5500. He has the required files available for download on the site. The link should take you straight to the downloads.
He also has a howto file which includes the instructions for flashing the rom and using the home on sd script.
It is possible to use other 5500 kernels, such as the cacko or crow ones, instead of the one provided if you prefer. I don't know if the cacko 64 0 kernel works with it though, I've not tried it.
Hope this information is useful. Perhaps someone would like to grab the files for mirroring?