Graph the cpu usage of certain processes

[Eric Boyd <eric (at) iconla.com>]

Hello again.

Has anyone created a graph that can show the cpu load of different 
processes on the same server?

For example, we have an OS X server running apache, MySQL, and a couple 
of other commands.

I'd like a graph that would show: the CPU usage of httpd as a blue line, 
MySQL as a red line and a couple of other processes each with their own 
color.

Since there are multiple httpd processes, could they be grouped and have 
their load added together?  I don't need to know how many processes are 
running, as this is already in procs.

-Eric