I am also highly interested in software development on the Zaurus.
native gcc compiler is easy to install on pdaxrom.
So what ROM should I use?
It depends on what you want
Which ROM is the most stable one?
Probably the sharp rom...other roms are quite stable I think
Which ROM has the largest pool of available software?
using debian in a chrooted environement is probably what will give you the
biggest number of application readily compiled. (search the forum for debian)
Of course having a lot of application is not relevant if the one you want is no there.
Can I use IPKs for Qtopia ROMs on pdaXrom? Which ones? What are the differences?
In general you can't. qtopia is not X. different libc version. different way to emulate floating point.
What changes are necessary for i386 Linux X appliactoins if I want to compile them on the Zaurus?
It depends. some just need a recompile. some needs some tweaking in the makefiles . some needs porting (for instance if they use some assembly code..or rely on the processor architecture).
You'll be able to compile lots of application if you know a thing or two about makefiles gcc and shell script
I have seen the screenshots of KDE 3.4 in the new pdaXrom. When will this ROM be available?
kde is available now for pdaxrom. some people manage to runn kde inside debian.
pdaxrom is not available on the c3000, though there is a guy who made a tarball targeted for the C3000. no date available for "official" pdaxrom on c3000
Do I actually need pdaXrom, or should I rather install X/QT on Qtopia to use X applications?
It depends X/qt works well. There is also intstruction for running X without qtopia with a debian system on c3000. search the c3000/c1000 forums.
Do current versions of the excellent Pi-Sync PIMs run on pdaXrom? The feed shows an old version (1.6.x?) of PO/PI.
yes there is a newer version in the "unstable" feed. step by step instruction to cross compile it are in this forum
I HAVE SAME QUESTION !
there was a lot of question there. and uppercase is generally considered as impolite.