SmallWindows is another Exposé clone. Exposé is a Mac OS X feature where a particularly keyboard shortcut makes all of your windows arrange themselves into small versions of themselves displayed all at once for easy task-switching. But, this one is free and, even better, open source. You activate SmallWindows by pressing Win-F12 or holding the mouse at the top-center of the screen. It pops up quickly and smoothly, and rolling the mouse over any of the "mini" windows shown will zoom in on it a bit, click and go, just as intended.