I know that the majority of commenters are panning this idea, but I for one like it, and wish I had one. I know you can get a monitor that is just as wide, but significantly taller and higher resolution, but for me that wouldn't be an acceptible solution at all. For productivity purposes it's inefficient to move your eyes in 2 dimensions. I can scan much more quickly just goign left and right then going up and down as well. When I have used computers with monitors larger than 24" or so I end up bunching my windows in the middle anyways, so the top and bottom of the screen is basically wasted pixels. I'd much rather have good vertical pixel density, and multiply it horizontally. At work (I'm an IT Project Manager for a major bank), I use a pair of 20" monitors and they're perfect. At home I use a slightly larger monitor, 24", because i occassionally watch videos on it.
I'd happily replace my monitors at home and work with one of these double-width monitors.