Photoshop Layer Shortcut 2

Double Click the lock on Background Layer : Change background layer to layer.
Alt + Double Click the lock on Background Layer : Change background layer to layer with default name.
Alt+Delete/Alt+Backspace (Photoshop CS 2 and earlier) : fill empty layer with foreground color.
Ctrl+Delete/Ctrl+Backspace (Photoshop CS 2 and earlier) : fill empty layer with background color.