Shades - Shades is a FREE utility for controlling the brightness of your screen.
Mountie - Mount a second screen (iPad/iPhone/tablet) to your MacBook
Simple Screen Shade - Description and screenshots of Simple Screen Shade.
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
myPoint Shade - Stop burning your eyes! myPoint Shade is caring for your eyes' comfort.
Luna Display - Hardware that turns the iPad into a wireless second display