8192 by 3840 pixel display (but can you play Doom3 on it?)
Steve Pietrowicz just left a comment saying "nice demo" for ZipCity. Steve has to be the King of the Cool demos. Check out this Smart Environments project that he did at the National Center for Supercomputing Applications. Steve used Java and Jini to create an environment of hardware and software services that was able to interact with people in a variety of ways. This room included a video wall with a 8192x3840 display. Check out the picture.
At JavaOne 2002 Steve won the Helix software competition with a program that used Java3D and FreeTTS to simulate a scanner to discover DNA sequence errors. The program shows the nucleotides being scanned, and FreeTTS announced when the program encounters errors.
So Steve, King of the Demos ... thanks for the kudos.