Use iPad as a Second WiFi Display for Your PC ( or in my case fifth )
I've been meaning to try this for a while. Displaylink has some great USB to DVI adapters that let you run extra monitors via your USB ports. Supposedly up to 6 displays, though I have never tried more than two USB. I somehow stumbled across the iPad app via the App store and finally got around to installing the PC side. I wish I had done it earlier. I don't really need the extra display, but the ability to drag a window to the iPad and march into another room to show something to a collegue is extremely handy, because it is a WiFi Display. Read that again.
One small caveat is that you can't use touch as the mouse on the screen and if you hit the home button it will exit. It is hard to break the habit of wanting to tap something on the iPad, so i found it is better if I put it just out of reach.
You can see in the next picture that it shows up as if any other monitor on the screen. 1024x768 isn't a lot of space, but it's enough for email, instant message, or a logging monitor. Again, the part I really think is useful, is the ability to pick up a monitor from your PC and walk into another room, provided you don't leave WiFi range.
Here's some links:
Displaylink iPad Software for PC
Displaylink App in iTunes App Store
Displaylink USB to DVI adapter on Amazon
Summary
In my office configuration, I have two 24" displays running off an ATI/AMD Radeon card, two USB to DVI adapters, and a WiFi iPad screen I can carry around the office ( but not interact with ). If I close the app on the iPad, Windows 7 automatically reorganizes the displays, which can take a few seconds with four monitors. One other thing to note on the USB to DVI adapters, they are not as fast, especially on higher resolution screens, so I tend to put more static content there, ie things that don't need to scroll a lot.
