dual monitors for programming

I know the main userbase for dual monitors are for graphics artists, but Im wondering how much of the programmer community uses dual monitors? I imagine that large hi-res wide-screens have solved a lot of problems with screen real estate for programmers, but Im curious what percentage of programmers use dual monitors in their work.

I use 4 monitors and two laptops on the same desktop and all of them are always used all the time. The main display for screen+emacs, and the other ones to rotate various pictures of Touhous for moral support.

Let's go back to discussing monitors!
As for myself, I use 6 monitors and three laptops on the same desktop and all of them are always used all the time. The main display for konsole tabs+vim, and the other ones to rotate various pictures of Touhous for moral support.