Question: Is there any tool that draws a graphic visualization of a process' memory?

I'd like a graph showing the percentage of pages in physical memory and in the page file.

Answer: 
[Process Explorer](http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx) has several visualization options for both individual processes and the system as a whole.
[Munin](http://munin.projects.linpro.no/) is what you need for Unix-like operating systems. Actually, Munin is great for graphing anything for which you can collect numbers. If you could get one to run a TCP server, it could graph the temperature in your refrigerator.