Well, this is not really a hint, but a nice bit of info I didn't read about anywhere: the new Copy function even works in the Calculator app! Just tap and hold your finger over the calculator's results area and select Copy from the pop-up menu. You can then paste the numbers in the app of your choice, of course. Very handy!
Sorry if this was obvious to some readers. I think it's the kind of thing that could have been overlooked, but Apple once again proves they do pay attention to detail. This new copy/paste thing works really all across the board.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20090622081112925