I have an article up at the Missouri Civil War Museum, entitled The Pioneer Baseball Era in St. Louis and the Civil War. The piece discusses the origins of baseball in antebellum St. Louis and the effects of the Civil War on the games development in the city, as well as attempting to put these developments in a national context. Follow the link and give it a read if you have the time. It's a more organized presentation of a great deal of the information that I've posted here as well as a reflection of my thinking after working on the Pioneer Project (whose publication sadly seems to have been pushed back to Spring of 2011).
I should also take this opportunity to thank John Maurath from the museum for his work on the article. John edited the overly long piece, added a preface and note about Al Spink, and also placed the pictures into the article. He did a great job with it and I'm very appreciative of his time and effort. While you