It's ok, memory use for working.Mem: 8015628k total, 7378692k used, 636936k free, 944884k buffers
Swap: 8388600k total, 2348k used, 8386252k free, 4120504k cached
TheVisitors, I believe that you have a trouble on your server. Linux OS must use ALL available memory for any processes: apache, mysql, cache, etc... How to linux os working with memrory you can read here http://www.linuxatemyram.com/
this is output from one of the my production server:
It's ok, memory use for working.
Your server use 74Mb from 2048, I think that's no good.