I've been wading thru the list of running processes on my N900, and a few of them caught my eye (especially since I don't use any scheduled tasks pertaining to them, or their corresponding desktop widgets).

/usr/sbin/bluetoothd -n (I keep BT off, unless I explicitly need it.)

/usr/bin/camera-ui (I definitely didn't use the camera since last reboot or switching off)

/usr/lib/evolution-data-server/e-addressbook-factory
/usr/bin/osso-abook-home-applet
/usr/bin/osso-addressbook 2x
(been a couple of hours since I last opened the addressbook - unless one of these has something to do with a contact shortcut placed on the desktop1?)

/usr/bin/modest 2x
/usr/bin/Calendar 2x
(didn't use email or calendar in the last session, and auto-check-for-new-email is off)

/usr/bin/browser 2x (file browser or web browser?)

/usr/sbin/wlancond (I turn WLAN off with the switch on the pull-down menu)

/usr/bin/image-viewer (a few hours since I used it)

Are all these supposed to be running, or can some be running due to incorrect termination, or something like that?