Dolphin Stadium twin-monster HDTVs has been contracted by the University of Texas to make one even bigger. As a part of renovations to their south end zone they are installing a 134x55-foot scoreboard, 370 square feet bigger than Miami's. As Engadget points out, it's actually slightly narrower and a little taller, bringing some conflict to the question of who is the biggest. All the same, if you want to check it out while everything is still bigger in Texas, you better hurry as a horse track in Tokyo is installing a 197-foot wide display.
If they had announced this last year, maybe Vince Young would have returned to lead them to another National Championship.
[Thanks for the tip Scott M!]