Jumped into the Deep End!!!

Control is now Command

Control-C was Copy on Windows Command-C is copy on Mac
Command-Q quits an application
Command-W closes an application
Hitting the red X button doesn't quit the application, it closes it.

 

Like you I am a new iMac owner after only owning PCs. The transition has not been too difficult. You might want to check out this link which lists common keyboard shortcuts.

http://docs.info.apple.com/article.html?artnum=75459

I hope this helps some.

 

All programs have streamline short cuts. Apple requires it when developing. A cool trick is that if there is a short cut the key commands will be next to the function in the drop down menus.