I took a look at this recently and have to say I wasn't particularly encouraged.
Most development has drifted off since Gentoo officially dropped support for the ARM architecture. This causes a range of problems since they won't be producing patches that correct incomplete casting for packages that affect ARM architecture (and I think Vax too). It would have been nice to bring the port up to date, however, at the end of the day the device patches for the various Zaurus models aren't all within the main 2.6 kernel source as yet and as such would require extra effort to make portage (emerge and other tools) work well with regards to Kernel upgrade handliing.
Since I'm mostly interested in POSIX stuff, the ability to run Python, ongoing maintenance because everything is synced with the main distribution and finally... stability.. I have chosen to persure OpenBSD and see how that works out. - So far everything is marvellous!, no special hacks needed that differ from a desktop system here
- Andy