Shape Services has launched the Android version of its iDisplay app which allows Android smartphones and tablets to become secondary monitors for your computer. While the app may not be ideal for use with smartphones given their small screensize, but using iDisplay on a Xoom or an iPad would be very nice. iDisplay is already out on iOS and works on both Windows and Macs.
Anyone who has worked with a second monitor knows how much more productive you can be. After you purchase iDisplay, you need to download the free iDisplay Desktop app to your computer and enter your computer’s I.P. address into your phone or tablet. iDisplay will synch up the two displays so that now when you're not on the go, you can still put your tablet to good use.
iDisplay costs $4.99 and is available now in both Android and iOS versions.