Launch Exposé

Exposé's All Windows mode (F3 or F9 by default)

Command-1: sort all open windows alphabetically by window title
Command-2: group windows by application

Exposé’s Application Windows mode (Control-F3 or F10 by default)

Snow Leopard: show you all windows from the selected application. if you’ve got Safari windows in three different Spaces, Exposé will present them all on one screen. If you then choose a window in something other than the current Space, Exposé will take you to that Space.

Leopard: show windows within the current space. If you’d prefer this behavior over the default Snow Leopard behavior, open Terminal (in Applications -> Utilities), and enter:

defaults write com.apple.dock wvous-show-windows-in-other-spaces -bool FALSE
killall Dock

if you want to revert back to Snow Leopard default mode, run the following commands:

defaults delete com.apple.dock wvous-show-windows-in-other-spaces
killall Dock

killall Dock must be run to relaunch the Dock

Command-Tab Exposé

Command-Tab until you've selected the application you want to Exposé, release Tab (keep the Command key pressed) and press the Up arrow. Release the Command and Up-arrow, leaving no keys pressed

Just click and hold the icon in the Dock for the application you want to Exposé

Cycle

Cycle through the applications in Exposé using Tab (or Shift-Tab)

Select

Select application in Exposé by typing portions of their names (as shown below each application), or
Select the application using Up or Down key

When selected the application will get a blue frame, and you can:

press Space Bar to zoom in/out on the application
press Return to select it (and leave Exposé mode)

Leave

Press Esc to return back to the application you were in when you launched Exposé

reference:

http://www.macworld.com/article/143529/2009/10/slexposetips2.html
http://www.macworld.com/article/142637/2009/09/106expose.html
http://www.macworld.com/article/143094/2009/10/exposename.html