Interestingly, the NCAA is running down a similar path as told this NY Times article about a blogger for the Louisville Courier-Journal doing a live blog of the Louisville Oklahoma State baseball game. This is similar to what Trent does on his blog. The NCAA argues that it violates their agreements with reporters and they're considering it a "live broadcast" subject to their approval. I think they're missing the boat too (and to boot, they cutting off their nose to spite their face as the blog allows real-time interest in their product. Very short sighted.
I think MLB's being greedy and they ultimately risk losing their anti-trust immunity, I think.