Dual 22" monitors hackintosh running OSX 10.5.6 6 spaces, normally 2 spaces per project and one for random stuff. (I like to arrange all my code in one space and all the docs and the like in another and switch between the two as necessary).

You'll notice the Macbook peeking out from underneath the desk on the left - if I need more screen space I pop that one open. Or if I'm not at home!

M-Audio speakers are crucial - good music is a help! And lots of paper / binders / books to refer to all the time.

At least 3 lights sdjustable to whatever conditions I prefer, and black shades in front of the blinds to block out sunlight and heat.