Recent apps on your dock for Mac

http://www.tuaw.com/2008/09/16/terminal-tips-add-recent-applications-as-a-stack-on-dock/

Type this in Mac Terminal

defaults write com.apple.dock persistent-others -array-add '{ "tile-data" = { "list-type" = 1; }; "tile-type" = "recents-tile"; }'
killall Dock