From google searches, this tool has apparently been around for a while. I don't spend time cruising the application menus (and maybe I should :), so I never new about it.
It's a nifty little thing. I didn't have much luck in the option to search for open files, but nice for a quick glance at a system. Odd thing is my network stats are nil, which I know isn't accurate. Might be the fact that I was VPN'd into Sun's network at the time. Need to check that later.
I found a demo of the System Monitor. It looks a bit dated - at least the menu path has changed. On my snv_111a system, the tool is found in Applications -> System Tools -> Performance Monitor.
:wq