I just got this idea of using an arduino together with an ethernet shield and some shiftbrites to create a huge led display. ny idea was that the graphics should be handled by a media server which whould probably have to be custom made and that the signal then gets fed to several arduinos covering the area needed.
lets say we have 3 arduinos and 1 arduino has the resolution of 32x8 RGB. every arduino has a hard coded id which replies to broadcasts from the media server and basically you could stack the arduinos and all you need is a network switch and a media server and you've got a 32 by 32 display running completely over the network.
Siliconsoul