I particular like the “GameCast” feature, which gives you a graphic of the field so you can see where the ball is, and a description of the last play. Here’s how it looks:
You can open up a couple of “GameCast” windows and keep an eye on all of them at once. If you have a TV in the same room as your Mac you’re all set-- put one game on the TV, and watch the rest on the internet. When GameCast shows you that someone’s about to score, or that the game’s almost over but still very close, you’ll know about it in time to switch the TV to that game. Sort of the poor man’s “picture in a picture.”
This works for the Pro’s too, of course.