Nokia released a 16 MB minor release for the n900. The firmware version is: 3.2010.02-8
I had some issues with the update. I basically ran out of rootfs disk space. The update application complains as: Not enough space in location. For me disabling all the extra repositories and running apt-get clean; apt-get autoremove did the trick.
This looks like a bugfix update, and might be paving the road for the PR1.2 release. Still official changelog is a mystery. For more info check this thread on talk.maemo.org.
Also the update takes another ~3 MB on your rootfs. 😉