Have you ever wanted recently launched applications in your dock like next to the other spring loaded folders like Documents and Downloads. Here’s how to do it :

Launch Terminal and paste the following 2 commands one at a time

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

killall Dock

have fun!