Found it! Code: rm [-f] /home/user/.cache/launch/com.nokia.controlpanel.pvr This is for getting rid of that annoying control panel screen-shot that Hildon always fails to refresh at the right time. (The -f is in brackets because I don't need it when I run the command. Qwerty12 - who all proper TMO members should know was a hacking pimp of awesome - posted it with the -f, so it might be necessary for some people *shrug*.) CasTTeLLo. In my experience, just running apt-get update, once or at most twice, solves things. I don't really know how, or why - every time I get this problem I really feel like I don't know what the hell to do, but I tend to redo the same stuff reboot, apt-get update, remove and re-add repositories... It tends to fix itself if you do those enough times. I really don't know why though.
rm [-f] /home/user/.cache/launch/com.nokia.controlpanel.pvr
Where there's a will there's a way-N900 RoCK!!