Hi, i can use a great deal of assistance before i do anything drastic(re-flash). I installed the libqtm-11 via x terminal last night in order to get FMobi to work. I awoke to see "Unable to receive or send new messages.
Device Storage full.Remove data to free memory."...i rebooted and also shutdown my n900 only to find, now i have no "recent call" log and also no access to the app. manager...i receive "operation fail" when opening it. The "unable to receive etc.." has stopped but i have this problem. Please help

That sounds like you're out of space on /home (also covers /opt). I'd suggest checking for any large files you might have in there, or you could try using apt-get from the command line to uninstall something.

Have a look here:
http://wiki.maemo.org/Free_up_rootfs_space

Open in terminal with "ls -la