Free Animated Gifs
Let's start with a few links to some of the better repositories of free animated gifs:
A brief word on behalf of fellow domain decorators. Please don't lift (i.e. steal) animated gifs from just any ol' webpage. After creating a few of these yourself you will understand how much work goes into them. And since there are so many fine free libraries it's not necessary to "borrow" others without permission. If you do see something you really like don't hesitate to contact the webmaster of the site. But don't just grab and run. Not nice.