[Q] How can I tell which things are running? topic

Hey,
When I turned on my phone the RAM it was taking was 300 MB, after a days use it is now 500MB (even after pressing 'clear RAM' button).
I've entered Settings->apps->running and it shows only two small things (the keyboard and some weather widget) which combined take only 20 MB.
So what is the rest of the memory is beign allocated for?


Thank you.