it really depends on what you want -- remember, the pdaxrom is a work in progress... if you want full pda and stuff that\'s been
polished, stay with another rom.  Me, personally, I want a mini workstation.  pocketworkstation is nice -- but pdaxrom has
the same, if not far more potential and immediate usabiility.
how much space?  all of it.  :-]  Although, I did move /usr/local to /home/local and then ln -s /home/local /usr/local -- that seems
to help.  I also installed firefox, gimp and other large[r] programs to sd.
do you need storage cards? no.  would they help -- yes... install firefox to sd... then when you reflash the latest pdaxrom, 
you can just ipkg-link mount /mnt/card and your firefox is back, etc.  you can always uninstall it fmo there if a new version
is compiled, etc.
I haven\'t made screenshots, although I really want to open up each app and take some shots, perhaps I\'ll do that tonight.
X/qt is something... but pdaxrom is x based.  it\'s designed with X in mind from the start.
Scott
ps: it gets more usable by the day -- and with the new SDK coming out -- it should really explode.