I've installed the following:
cli:
xterm - because I need command line and root access

networking:
open-ssh - because what good is linux with out it?

gui:
load monitor
GPE PIM
maemo-mapper
phoneLink (I wrote it )
Tuner (to help the kids tune their instruments)
Maemo Recorder : it's fun !
Password Safe : it's my memory
File Manager : quicker alternative
FBReader : ebooks

Games : you never know