Exposé was a Snow Leopard feature that apparently didn’t get as much use as Apple would’ve liked, so most of its window arranging goodness was bundled into Lion’s Mission Control feature instead of remaining on its own. The change means most of Exposé’s window arranging control is available when you enter Mission Control view, but a couple of the feature’s keyboard shortcuts are still available, too.
Exposé’s Show Desktop and view all windows for the current application features are still available, and they still use the same keyboard shortcuts.
Exposé lives on in Mission Control
To slide all windows out beyond the edge of your Desktop, use the F11 key. Tapping F11 again, or clicking the dark gray screen border, will slide all of your windows back into place.
Use F10 to view all of the windows for the active application in an easy to scan grid. F9, which previously displayed all of your open windows for every running application, now launches Mission Control — and the view looks very similar to Exposé from earlier versions of OS X.
Even though the Exposé name may be gone, at least its features live on, and that’s good news for people like me that rely on its window sliding goodness every day.