If you're looking for some extra screen real estate for your laptop, Ben at weblog build-its has a guide on taking apart an iPad LCD screen and using it as a second monitor.
Photo by Ben
This setup is different than the Air Display app we have featured in the past, as it requires some technical know-how and only uses the iPad screen component, not an actual iPad. Ben managed to snag some iPad 3 LCDs on eBay for $50 a piece and discovered that internally, they use a DisplayPort interface. After splicing the ribbon connector into a DisplayPort cable, you just need to add a backlight driver and you can use the display with any computer.
The screen only needs a DisplayPort and USB port to work, but keep in mind that Ben had to do some component searching to get the screen running at a higher brightness setting.
Ben is working on a custom case to enclose everything, but in the meantime, for instructions on how to make one yourself, check out the link below.