I believe I'm using the basic maemo repos. apt-get just says this is what it's going to do. It also lists a bunch of 'osso', 'hildon' and the like programs for deletion.

man-db's apparently in the SDK repo. apt-get wants to remove 380 files.

I sometimes prefer apt-get to the manager apps.
The N900 has seemed vaguely buggy (slow, occasionally freezing) lately.