Air Bud: Seventh Inning Fetch - haven't seen it.
Ed - seen about 1/2 of it; it's as ridiculous as you would imagine.
Rookie of the Year - cute movie.
The Sandlot (best baseball movie of all time) - I still have not seen this.
Major League - very good, some iconic lines and moments. Perfect choice of theme song.
Brewster's Millions (it counts) - pretty good.
Bad News Bears - it took two viewings before I "got" this movie. At least, I think I get it.
Mr 3000 (underrated) - meh, it's OK as baseball comedies go.
Bad News Bears Breaking Training - haven't seen it.
A League of Their Own - saw it too long ago to remember much about it.
The Pride of the Yankees - haven't seen it.
Field of Dreams - I think it's good, I really need to rewatch it.
Bull Durham - I don't care for Sarandon's character and the romance drags it down, but the stuff between Crash and "Nuke" is hilarious
the Natural - didn't really get it/see what the fuss was about. It's kinda boring.
Also receiving votes:
It Happens Every Spring - good comedy with Ray Milland inventing a substance that makes it impossible for a bat to hit a ball. (I don't think it's shown in the movie, but I assume he switches out the doctored balls for regular ones now and again, or else a string of 27 strikeout perfect games would look a tad suspicious).
Moneyball - the book was OK but became a bit of a chore to read after a while. I think the movie did a fair job of covering the basics and making it watchable, but Jonah Hill is terrible.
Angels in the Outfield (1951) - if any baseball fans hate this movie, well, I just don't know what to say.
The Fan - good psychological drama about De Niro, deranged fan, and Wesley Snipes as the player and source of his obsession. The book was better.
Major League 2 - it's poor, but still has a couple of good jokes.
42 - wasn't feel good, didn't pull punches.
61* - good movie, the two actors playing Maris and Mantle were good.
The Rookie - feel good movie based on a true story.
Ken Burns' Baseball - required viewing.
I think I saw the movie of Eight Men Out when I was a kid, but don't remember much. The book was amazing.