Upload & Sell: On
Stumbled across this app being reviewed on youtube last night called Air Display (and I searched for it on here, only saw it mentioned in a few in-thread posts), it's an app that lets you use your iPad as a completely wireless second monitor that can mirror your desktop or extend it. It'll come in very handy with Lightroom for processing photos on the road when I want more realestate to work on.
Two ways to make it work: Laptop and iPad have to be on the same network, OR, you can setup an Ad-Hoc network on your laptop to connect directly to the iPad. http://avatron.com/apps/air-display
It's pretty fast, only lags when I drag huge windows onto it. Costs $10.