Symbio created a 12x12 Windows Phone formed display, totaling 144 devices, at the TechDays 2012 event in Helsinki, Finland. The display is able to take input from a single Windows Phone for control and relay content beamed from a web server (over WiFi). The result is pretty spectacular and is also a world record.
Impressive stuff. What do you guys make of this? 144 phones would be a fairly expensive investment (in cost and power), so we'd still recommend a decent 50" TV instead.