o it seems that many apps are not saving their config or changes in their config files like for example the wallpaper config
which starts blank at each session or konsole which doesn't save new profiles
o kwalletmanager does not seem to import properly the kde3 one (which is bad)
o kmilo does not seem to work, does it ?
o suspend doesn't work any more, it was setup by klaptopdaemon in kde3
Import KDE3 config doesn't work.
Current KDE4 packages use .kde4 as kde home and KDE3 use .kde.
That situation will change when KDE4 will be good enough to replace KDE3.
You can remove your .kde4, copy .kde to .kde4 and see if your config is properly imported.
cheers,
Fathi