Six Apart has joined forces with Major League Baseball to create MLBlogs.com, a blogging service that lets baseball fans created their own blogs using branded templates. Business Logs has a great write up on the effort, and addresses some of the issues. Some of these issues are the value proposition to users, as well as failings in the design of the site.
It will be interesting to see what kind of traction this blogging effort receives. As Business Logs puts it: "Remember those football team collectible pencils from back in the day? Yeah, this is about as cool as those were." I've done some work in the arena of sports and blogging, and the sports audience is extremely active online. I wouldn't be surprised if the community aspect of these blogs is enough to give it some momentum.