iDisplay is a universal android app that turns your Motorola XOOM Android Tablet into a second monitor for your Mac or PC.
For multi-users who want to increase their productivity, iDisplay expands the viewable area of a user's main monitor. You can move programs such as IM, Twitter and news gadgets into an external display, especially for those of us with the beautiful 10.1" 1280x800 display of the new Motorola Xoom tablet. And your main monitor is freed up for displaying only software which require more view space.
Download iDisplay from the market link