For those among us who like slick control movements, and own both Panther and a multi-button mouse, there is a neat trick for moving files from one window to another that Exposé allows for that may not be advious to new users.
Lets say you want to get a file from your desktop and put it into a window and you can't see either. Press and release the desktop reveal key (F11 by default) and then grab whatever file you want off the desktop. While still holding the drag mouse button down, press the Exposé button (F9 by default). Move your file over the window you want to drop it in, and press the Exposé button again. You can now release the drag button and place the file where you wanted it. Pretty slick.
[robg adds: Exposé is clearly one of the most interesting new GUI features to come along in a long time. In testing, I loaded up a screen with something like 50 windows of various sizes, and Exposé still had not trouble at all sizing and positioning them all for easy visibility. Pretty amazing when you start thinking about the math going on in the background. As this hint points out, you can use Exposé as a giant clipboard of sorts, if you consider your desktop as a virtual clipboard.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030926115215758