At one point I ran 3 Sony Bravia 40 '' @1920x1080 but frankly the room my main rig is in already is offset by 20 degrees compared to the rest of my house. so I decided on going back to one 40" at 1920x1080 and a smaller monitor that I use when I need a second one to look at things in different resolutions or have a screen for notes and reminders. I use the other 2 40" monitors in a different room currently, also at 1920x1080 for music creation and to live monitor my booth. I find that when creating music you absolutely need more than one monitor in order to see all of your audio hardware emulation and music creation software even more importantly when you have the need to make changes constantly in real-time. In this situation, the more pixels the better.
Most of the reason that the primary resolution I use is 1920x1080 is because full hd programming is that resolution and I want video to look good full screen without any scaling and without having to add black bars and without having to cut off any of the top or bottom of the video. Because of these reasons...now when I look at any desktop resolution less than 1920x1080...I start feeling claustrophobic.