I run Ubuntu on my 13", it's a great Linux machine. It was really tough to install without a CD drive, but finally I made it. Everything works, but waking from sleep and reconnecting the wifi takes ages compared to OS X.

That said, I too would love to be able to work on a tablet. Basically all I need is vim and Chrome. What I'm thinking is connecting the iPad to a bigger screen and using the pad as a keyboard, but nah it doesn't seem realistic.