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What do you mean...? A web browser window...?

If so: Make a new bookmark (preferably in your Bookmarks bar) and call it Full screen (or just [F] as mine is called), then edit the address/location to:

javascript:self.moveTo(0,0);self.resizeTo(screen.availWidth,screen.availHeight);

And, voilà, you have a Full screen button.

Now, don't overuse it. Full screen mode is not good for you... ;)
 
EDIT : Or that. :rolleyes:

You can drag a window from the bottom right corner. However, I take it your a recent switcher and unlike windows, OS X isn't really meant to do such things. I see this partially because it's such a good OS for multi tasking. I'm sure it's something you'll grow use to over time.
 
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