[z0r]

That's my setup, 3 vertical 24" monitors. Same benefit as having the 'main' thing in the middle on a big screen. Text editor takes up the full middle display at most times, a terminal (or stack of terminals) to the left for compiling / examining debug output, and the rightmost display is for hacker news. I look at the rightmost display too often.

In all seriousness the tiling window manager I use (xmonad, but any other would probably do) is more important than the number of displays I have. But it is nice to be able to use 2 vertical displays side by side to do an eyeball diff of output at times, or to keep reference material visible on the display right by the code I'm working on.