10xWSChamps mentioned NorthSideBaseball in a thread I was reading so I thought I'd check it out. It's a cubs board that appears to actually have a lot of solid input and posting. A lot of the same forum posting rules we have here. I was a bit surprised with it being a Cubs board.
It's definitely not as eye sight friendly and easy to read and follow as RZ though.
http://www.northsidebaseball.com/forum/forum?f=2