IMac Freezes. - new to mac's not sure what to do.

I'm a PC convert, just purchased my iMac a week ago. Have not played with a Mac since high school.
Sorry I am such a newbie with Mac's - I am an MCP and was tech support rep for Microsoft for a few years so I'm not computer illiterate, just mac newbie.
So far I have had the Mac hang on my twice. The screen will freeze and i cant get any response from the keyboard, mouse moves but clicks do nothing.
1st time is happened - I had all sorts of stuff running, iChat, camino, firefox, and World of Warcraft.
Screen froze, I could still communicate with the person on iChat they could still hear me and see my video, but it was all hung on my side, after a moment of trying to click and hit buttons the sound started to loop and the iSight light turned off - at that point I just held in the power button and it shut down. restarted and things seemed fine.
let the Mac go to sleep like normal.
Next morning woke it up and did a few things before work and it all worked fine, put it to sleep while I was at the office.
Woke it when i came home, ran a couple apps and all was good. This time i closed all the extra stuff I had running and just ran World of Warcraft. played fin for a few min then it froze again, same thing as before all i could do was move the mouse, nothing else worked. After a few moments the sound started to loop so I just held in the power button again.
So... What can I try to trouble shoot this?
Are there log files that are created on a hang? Is there a way to Alt-Ctrl-Del feature like windows? Any good apps to use to check hardware and such?
System is a 20-inch iMac w/ 2.16 and 2 gigs ram, plus the upgraded video Ram - 256 ATI - All installed direct from Apple.
I have not installed much yet - a few little apps like Shapeshifter and SteerMouse 3.5 as well as lots of widgets.
I did try to install the X11 from the apple disk so I could run openoffice, but i was unable to get that installed it seems to just reinstall all the iLife stuff. Maybe I messed something up in that process?
Any tips would help.
Thanks.

The problem may be with WoW. That's the common denominator here. I would make sure you have all of the patches/updates for WoW.
There is a log file called system.log that tracks most information about what's going on with your machine at any given time. There is a crashreporter log in /Users/USERNAME/Library/Logs/CrashReporter/. When a application stalls you can usually force quit it by using the keyboard command Apple Option Esc (similiar to Task Manager in Windows) then highlighting the application and selecting force quit. You can also kill -9 the program by using the process ID in Terminal.app.
As far as Ctrl Alt Del you can Ctrl Apple Power to restart or just hold down the power button like you did, to shut it down then power button again to start it.
PowerBook G4   Mac OS X (10.4.8)   MacBook Pro

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