Performance Monitor for Mac

What started this was my desire to make sure they really gave me the 4gig memory that I paid for. I was trying to find out the easiest way to get that information on the Mac. In windows you simply right click "My Computer" and get alot of that information right there. Ctrl-Alt-Del / Task Manager also gives you that stuff.

Google lead me to this: http://www.mac-forums.com/forums/showthread.php?t=120126. Which essentially mentions the activity monitor in Applications/Utilities and also the free download from apple.com called istat: http://www.apple.com/downloads/dashboard/status/istatpro.html.

This little app was free, installed very easily and is accessed by clicking on the dashboard icon 2nd from the left on the dock, or whatever that line of apps is called.

I still struggle getting around on the Mac. I installed VMWare and was confused, although I can tell it will be fine after a couple shots at it.

I got a message from VMWare that there was a newer version, but I clicked away the error and for the life of me I cannot find the mac version of Help/About. I just want to see specific versions so that I can identify upgrades.