I just happened to read this interesting thread, so I've tried the df command (which I didn't know about) on my N900 to check the free space. So, just to let you know...



rootfs 233344 183088 45972 80%
ubi0:rootfs 233344 183088 45972 80%


I only installed apps listed on the maemo5 download section in maemo.org, with the exception of fennec.

Installed apps are:

aMSN
Bounce Evolution
Conversations Inbox Desktop Widget
Facebook Installer / Facebook Widget & Photo Uploader (disabled)
OMWeather (with 2 extra icon sets)
Password Safe
rootsh
vim
vncviewer
zoutube
fennec