I knew I shoulda taken some pictures of my Madden Bowl 2007....
We play Madden each year during the Super Bowl in lieu of the real game (as it's usually not interesting). I set this up in 2006 when I first got my X360 - we have about 2 dozen kids participate in it.
It's really fun playing Madden on a huge screen - in our case, it's about 15' x 12' 4:3. It was FAR better than the real game last year - the score was 45 to 42, with 28 total points being scored in the last 3 minutesof the game :-p
I'm going to be buying a projector for X360 games sometime soon, since I'm now a youth pastor at a church. So 10ft+ gaming enjoyment: here I come!