|To Hide applications.||Cmd+Option click an App’s icon in Dock|
|To know the Dock Item Location with Finder||cmd, Click on the icon in the Dock|
|To move an item from dock to any other place||Cmd Drag the icon from dock to any other place|
|To Open a file in a particular app||When App is opened drag the file while holding it to the app|
|If you want the dock to move to different place on screen||Hold Shift and drag Dock divider|
|to change the size of icons in stacks||Cmd+plus(+) or Cmd+minus(–)|
|To tern magnification off and on temporarily||Hold Control-Shift|
In Mac OS X Lion you can simple your task by using shortcut keys on keyboard.Use of shortcut keys always helps you to quickly done your job without using mouse or trackpad.