Exposé
Arrange thumbnail windows in Exposé
03/19/2010
In Snow Leopard, when using Exposé to show thumbnails of all windows, press Command-1 to arrange them by name or Command-2, by application.
Use Exposé inside of Spaces
01/23/2010
When viewing all of your Spaces, you can use Exposé to show every window within each space by hitting Fn-F9 on your keyboard.