portable tablet using a Mac Mini

I've been thinking about buying a Mac Mini to use as a home entertainment center, but I think I'm going to wait until January and MacWorld to see what else comes along. Something I never thought of was using a Mac Mini as a portable computer. Peter Green has rigged up a touch screen with his mini and built a stand. It looks nice and he's got a battery which will run it for 3 hours. He's got photos on his own site and there is an article about it on TUAW.