To become the Cub fans equivalent of the Daily Kos? If so, I think it's a brilliant idea. The Kos format is easy to navigate, allows everyone to get their say in and, for the most part, is self-policing. Additionally, it really seems to create a better sense of community than, say, a usenet group or even a bulletin board. Daily Kos ran into some trouble from its own success: too many people were posting diaries and threads before the election were getting two and three hundred posts an hour, but I don't see that becoming a problem here unless it gets the 30k membership rolls like DK and the Cubs make the World Series.
So I guess that leads to a second question: What exactly is on topic here? Clearly diaries like "GWB is a Fascist" are out of bounds, but how narrowly focused do you want it to be? I read "and another thing" mostly to live vicariously through reading the exploits of the bleacher bums, but I get the sense that Al wants this to be more than just his own online diary, or he wouldn't have allowed these diaries (which I hope I'm not abusing).
Anything on the Cubs is clearly on topic. But what about baseball in general? Something on the Cardinals or Astros is of interest, what about the Nationals? Same league, I guess. Then what about the Angels? Or someone's general research on leadoff hitters? (Actually, with CP, that's pretty dead on topic)
Finally, I have no interest in the Bears or the Illini, but I know others in the Cub fan community do. But I do have an interest in Al's movie reviews and would hate to lose that part of "and another thing", especially in the slow periods. But I can understand how they might veer things off topic.
So Al, I guess what I'm looking for is a philosophy statement. :-) Sorry.