I read the http://wiki.maemo.org/Free_up_rootfs_space page and cherrypicked the following:
- mkdir -p /home/user/MyDocs/apt-archive-cache/archives/partial
- relocated /usr/share/themes/{alpha,beta} to /home/user/themes
- apt-get -o dir::cache=/home/user/MyDocs/apt-archive-cache <command>

were <command>'s are 'update', 'upgrade' and 'dist-upgrade'. (Maybe I should have reversed the order or 'upgrade' and 'dist-upgrade' ?)

A lot of stuff was updated, portrait browsing, no more "more"-icon, Qt 4.6.2.

BUT the About product is still showing Version: 3.2010.02-8 instead of expected 10.2010... can anyone tell me if I'm updated ?

Update: Thank you benlau, by '# apt-get install mp-fremantle-generic-pr' fixed the rest of the updates. About product is now showing me the expected Version 10.2010...

'uname -a' gives me:
Linux Nokia-N900-42-11 2.6.28-omap1 #1 PREEMPT Thu Apr 15 09:47:09 EEST 2010 armv7l unknown