I think that that clue from a year ago provides an ample amount of information. Along with that post by Dave on that picture and some examination of the patterns in past games, there's alot to think about. In fact, our team has come up with so many theories off of that one picture, we added a page to our website about it.
http://team291.org/Team291/2007_Game.htm
The whole website thing isn't 100% done yet so there may be a few typos.
Also, I would have liked to post this entire thing onto ChiefDelphi just to keep all theories in one place, but it was just too long and we wanted to have lots of pictures with it.