How to see what processes are using my memory?

I recently added more RAM to my system and I always keep Activity Monitor running with the memory usage icon on the Dock to see how much Lion and my programs use.
I noticed that even several CS5 programs running at the same time won't use that much, the program I've seen uses the most is Aperture, using anywhere from 500MB on start to 2.5GB while viewing--not editing--photos.
My questions is, when my system is running normally it uses from a quarter to half the total memory available but just now it's using more than three quarters and it's running not even half programs I use everyday. I quickly added up the memory being used and it's just missing out A LOT. I'm adding a screenshot of Activity Monitor for you to see.
I now that restarting the system (or by using the purge command in Terminal) will free up memory but this really puzzles me and I'd really like to know what's happening--BTW, even though several GB are missing, the computer is nowhere nears slow, at least.
Where are all the other processes using the rest of the memory?
I'm using OS X 10.7.3 Server with 16GB of RAM on an iMac.
Thanks for all your help,
Gustavo.

You will never be able to get those numbers to add up.  This topic has come up before.  Examples:
Memory used by unknown processes
Where is my memory?
And others.  You cannot use the numbers in that display to add up.  Even doing top in terminal produces conflicting numbers.  Many process are dynamic and may be missed in these displays.
FWIW, here's an apple article on the Activity Monitor memory display:
Using Activity Monitor to read System Memory and determine how much RAM is being used
Editorial: In my opinion I do not recommend always running Activity Monitor (or top).  The constant poling and display does have some affect on performance and cpu utilization.  That's why it always usually appears near the top of the process list when sorted by percent cpu unless really outweighed by something much bigger.

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