there is a kde 3.4 for pdaxrom. it works..and is kinda cool. no need to chroot
the other wms..ice and xfce should show your apps just fine
vlc has a gui. mplayer has given me better, much better, video playback.
firefox is just big. a faster sd probably won't make any diff on a Z anyway.
my solution is multiple browsers.. a heavy, firefox or moz..and a light, dillo or links
atm I have dillo, firefox, mozilla, links, full konqueror, embedded konqueror all installed. This is probably some kind of obsessive excess, but you get the idea.
if you have a microdrive, a real swap partition migh help.