I've bought a Cintiq. (You know, a fancy tablet that's basically a screen you draw on.)
It has changed my life, and not just in that I'm now one thousand pounds poorer and much more worried about being burgled. It really is amazing. I'll never go back to "paper".
Here's a fascinating insight into my three-screen setup (the wi-fi imploded, so I had to sit within a two metre radius of the router) as you won't see on the Guardian.
For a much better overview of the Cintiq and it's awesomeness, look at this article on Gizmodo ("Verdict: simply amazing".)