Already have an Android Tablet running 3.0.1 or above or a phone running froyo and above and a PC with XP, Vista or 7 and want some extra real estate for it? Well, ScreenSlider is the app for you! Allowing you to use your device as a second monitor, ScreenSlider allows you to do so only over a wireless local network. Sadly, no Linux or Mac Versions are currently available and neither is Windows * supported.
For the sale price of £0.62 ($1) on the Play Store, this app is cheap for what it does.