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Snow Leopard has introduced a tweaked Exposé that includes a couple of nifty enhancements. Firstly, you do not need to press F10
to access Exposé. Simply click and hold your mouse on the dock icon to activate Exposé. From here, you can see all your windows, but you can also quit (or force quit if you hold option after Exposé has launched), hide, and perform other options on the application. Secondly, once you're in Exposé, you can zoom in to any window without leaving Exposé by hovering your mouse over the window and pressing the space bar. While these tweaks might not sound like a lot, they definitely make organizing your windows significantly more easy.
Plus, when combined with the next tip, the re-engineered Exposé can significantly reduce overall clutter on your dock.