I think the mere existence of this site explains why the internet is without a doubt one of the best things humanity, with our under-utilized brains and opposable thumbs, has managed to fashion.
Note that I will not be subscribing to the service, but it's great to know that it's there.

I have, however, bookmarked this one. I used to sit up late in my bedroom as a kid, with headphones plugged in, trying to pull random sporting event broadcasts off of the AM dial. I'd love coming across a minor league game from another city. From Greensboro, I could listen to stations as far away as Saint Louis, San Antonio, and Montreal. The fact that I can now listen to any minor league game for free is just beautiful.