I love Hoosiers and Remember the Titans. Both great movies as well as reminders that sports have an important place in ones life, as opposed to being ones life.
Now you may find this one to be rather bizzare, but I LOVE A Knight's Tale. It's about jousting and set in the 1500s or something like that. But a great tale of how somebody with the passion to get into a sport and really work at it can succeed and win friends along the way. The soundtrack really rocks as well. I listen to it on the way to every assignment to get me up for the game.
And, like Ref Ump Welsch, I like to watch sports movies in the off season while I wait impatiently to pursue my obsession