New to linux, still learning.

Starting to get memory full errors when running programs. Below is the output showing 98% of the internal memory of my device being used. File manager, storage details, data, indicate there are 47M installed files and 91M other files installed.

/ # df -h output...

Filesystem Size Used Available Use% Mounted on
/dev/mtdblock4 4.0M 2.6M 1.4M 65% /mnt/initfsnone 512.0k 80.0k 432.0k 16% /mnt/initfs/tmp
/dev/mtdblock4 249.5M 244.1M 5.4M 98% /
none 512.0k 80.0k 432.0k 16% /tmp
none 1.0M 60.0k 964.0k 6% /dev
tmpfs 1.0M 0 1.0M 0% /dev/shm
/dev/mmcblk0p1 120.0M 119.3M 720.0k 99% /media/mmc2/dev/mmcblk1p1 1.8G 670.3M 1.2G 36% /media/mmc1/ #

Is there a way to list the 244.1M of files so I can determine files which can be deleted to free memory? I would like to free memory w/out removing installed programs.

Any other pointers to free/conserve memory? Not interested in booting from SD card at this time. (Need a little more exp.)

Thanks