When a program wants your attention, one way it can get it is to bounce its Dock icon.
In previous versions of the system, you had to make the Dock visible (assuming you kept it hidden) by moving your mouse into the Dock area before clicking on the bouncing icon.
Now in Snow Leopard, you can catch icon while it is "in the air." I know that this may not be the most useful hint, but this new behavior may not have been noticed by everyone yet. I like it; I find it much more intuitive.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20091201082946882