Two Heads are better than one, Three is even better!!

Steve Richards posted about his setup with 3 monitors.  3 x 19 Inch monitors that is. Here I am working on my one screen makes me very jealous. I have been thinking about spending some time and money on my home office setup and this is probably a part of that.....at least 2 screens anyway. I can understand the productivity gains. For me when I am coding it would be great to have the development tool on one screen and then run the applicaiton on the other screen. Or have the tech doco (MSDN, Domino Designer Help etc) open on the second screen while I code.

The idea of having the distractions on one screen, ie Instant Messaging, is also attractive. I often do web demos and the problem them is always that when I share part of my screen or an application I don't have enough screen real estate to then make notes as well as I go. Two screens would fix this.

Microsoft Research also have an interesting article on using more than 1 screen.

I wonder if there is a point where more screens is too many. Would 4 just get out of hand?