By far the best game you'll ever purchase on your mobile device if you're into football.
Backbreaker is that Euphoria-based football game coming out next month for the PS3 and the Xbox 360, but they've also released a mini game for $3 on the Iphone and the Android.
It's ridiculously fun. You basically run down the field and waves of linebackers and DBs try to tackle you. You have jukes, spins, and "aggressive mode" which is basically sprinting. Also you control the angle you run by tilting the phone.
Here is the video for the Xbox version of the tackle alley minigame:
and here's what it looks like on the android / iPhone: