I like nationpastime.com
I just started www.thisdayinbaseballhistory.com. It's a daily audio segment currently heard in seven states.
Didn't see Baseball Cube mentioned: http://thebaseballcube.com/
Chop! Chop! Chop!
I hope it's not considered spamming if I throw my own hat in the ring. I run phillysportshistory.com. Name pretty much says it all, we do all sports, but really focus on the Phillies and the A's. If anyone ever wants to write about Philadelphia Sports History, please feel free to contact me. I'm always looking for content. We don't pay or anything, but it's a labor of love and I think we run a really nice site.
Thanks for posting the Everyhalloffamer.com page too! Wow, that's incredible. Gonna post something about that young lady this week.