NFL - Raiders, because growing up I just latched on to them. Sadly we've not been a championship team in some time and the only Super Bowl I saw them in was a huge upsetting loss. It hurt to watch that game. Also secondary team is the Dolphins because we had season tickets for a few years... Man I pick losers lol.
NHL - Tampa Bay Lightning, just always liked the team even though I have yet to see a game, secondary is the Panthers but only because they were the first team I saw live and at the time they had one of the best goalies in the league (John Vanbiesbrouck).
NBA - not a fan of basketball, sorry
MLB - Well, the Marlins because after they won their first World Series people shat on them saying they just bought talent so they cleaned house and came back a few years after and won again with a new team. Other than that the Red Sox because it was their curse breaking series win that I watched. I don't really follow baseball though.
NCAA - FSU, and second is Alabama. Reasons for both are family and extended family who went to both.
I don't watch much sports these days though because the games just seem bogged down by politics and pay scale. I don't understand how athletes can get such high paychecks and have shit years and not get pay cuts except by contract crap. I think the games would be better if their pay rates were defined by how well they play, not necessarily by win though. Why I say this is exemplified by Randy Moss' attitude when he played for the Raiders. He basically said he wouldn't play for the team because they weren't up to his level but collected a paycheck. I wish I could have a job where if I didn't like who I worked with I could sit on ass and not get fired.