Wow, I was putting my SL-C3000 through it's paces.
I'm running a proof of concept pdaXrom environment using /dev/hda1 as a single root file system pivot rooted off the flash partition. So far things are looking great.
I was looking around for software to replace my Qtopia stuff and came across http://metromap.antex.ru/
This package is a regular python package and requires no compilation whatsoever, simply install the full version of Python from the pdaXrom feed and you can run this straight from the directory that you unpacked it (or you can choose to make install which copies stuff to relevant locations on your machine).
You need to Alt-Drag around and it's not the snappiest of things on a Z but apart from that it runs fairly well