MLB: Braves, Mariners, Padres (always a big Tony Gwynn fan and now they have Maddux)
Minor league baseball: Montgomery Biscuits (they have one of the nicest stadiums that I've ever seen and great crowds...Barons games suck in comparison)
NFL: Steelers all the way but I now pull for the Titans also as I can realistically make it to some of their games each year w/o having to jump through hoops...
Bama
Rams before they moved. Now it is the Falcons.
Thrashers
Braves
And you gotta love the All Blacks. They are to rugby what Alabama is to college football.
MLB: I pull for the toothpicks. The toothpicks I have to use to keep my eyes open when I'm subjected to something as boring as MLB. If I must, I pull for the Rangers.
NBA: Whoever Shaq plays for and whoever Iverson plays for. So, Nuggets and Suns.
NFL: Cowboys and Titans and whoever picks Shaun Alexander up.
NHL: Flyers because my soon to be in-laws are from Philly, so it helps them forget I'm a Cowboys fan.