Was that back in the old days before wista/win7, when soanning mode was supported?
I use 3x24" Dell u2412M (1920x1200, though gaming at 6048x1200).
If eyefinitry supported uneuqal resultions, I'd seriously consider replacing the centre screen with a 30" 2560x1200, and putting the side monitors in portrait. I do wonder though if I'd lose some peripheral vision there - current monitors do fill my field of vision while Im gaming.