First off -- thanks to penguinbait and and everybody else that fills this forum with quality info. This device would be pretty dull without all their impressive hacking.

If, for some reason, you get a Cannot install package when attempting to install the kde-3.5.8-mmcX.deb package, you probably won't be able to uninstall or install it again. Several people have had to reflash the device.

The above happened to me last night. The reason, as I found out, Windows XP automatically renamed the .tar.bz2 file to .tar.tar (so, this renaming doesn't just happen on Vista. Unfortunately, I didn't realize it had happened until I attempted install of the second package, and got the failed install). Multiple attempts at re-installing/removing/updating were unsuccessful... The only recourse was to exit into terminal and do the following (you probably have to be root):

rm /var/lib/dpkg/info/kde-mmc*
dpkg --remove --force-depends --force-remove-reinstreq kde-mmcX

This uninstalls the package. You can now attempt install of kde-mmcX again.