Swipe Up to Zoom in on App Windows Within Mission Control
Dec 20, 2011 - 6 Comments

If you have a lot of app windows open in Mission Control, hover over a group of windows and use a two finger swipe upwards to expand and zoom on just those windows. This makes easier to differentiate windows and select one that may be obscured behind others in the default view.
Using a defaults write command you can also set this zoom feature to show the full size of windows in Mission Control.

You can also hover over the window and hit spacebar which does something similar but pulls up a bigger preview.
I use this too, it’s Quick Look
I dont know if anyone’s noticed this before but this effect its a bit different to the one advertised in the osx lion commercials, in the commercials when a cluster of windows is expanded all the other windows that do not belong to the app cluster that’s being expanded shrink to just the app icon, you can see it in here http://www.youtube.com/watch?v=6X7i3L0TRE8#t=51s
[...] Via | OsX Daily [...]
I just found another trick… double tap with two fingertips on an open app icon in the dock, it will bring up expose for that application. It activates the “show all windows” command.
Also when inside “show all windows” you can hit the ` key The ~ key is above the tab.