Following up on the post about Element Labs Versa TILE system, here are more examples of innovative large-scale displays:

And if all you ever wanted was a USB-driven Disco Dance Floor, you’ll want to have a look at the one hacked up by MIT students: 1E Disco Dance Floor. True to the MIT hacker spirit, they have released a PDF with complete documentation of how to build the required hardware and software under a Creative Commons license (Attribution- NonCommercial- ShareAlike 2.5).

Some links from the excellent infosthetics.