my 'free' shows:
$ free
total used free shared buffers cached
Mem: 3974852 3909092 65760 0 115240
2278888
-/+ buffers/cache: 1514964 2459888
Swap: 4070544 128 4070416
What is the main purpose of your machine?
mine runs Apache/MySQL/Postfix
i wonder, why you cache is so much higher than mine...
