[liuhenry]

Reading the headline, I thought "if this can output the computer's display to the iPad, I might consider buying one".

Pen-on-screen graphics tablets don't come cheap. Wacom's entry-level Cintiq is priced at $999. Add a pressure-sensitive stylus and the iPad may very well have a viable market for this kind of application.

[semanticist]

AirDisplay (http://avatron.com/apps/air-display/) lets you use the iPad as an extra touch-screen display over WiFi.

Friends who tried the initial releases said that it felt like a 'slow VNC connection', although I think they've improved responsiveness in later releases.