Just to be clear, I'm building a real-time service for sports information. It will have some of the attributes of Twitter, but it is NOT a simple Twitter clone.
:-) It's all part of the grand StatSheet Network plan. stat.us will be integrated into statsheet.com heavily and may be integrated into the upcoming StatSheet subscription service.
I really hope your target audience goes for it in a big way. There are already some people that I unfollow on game day. And having a sports focused version would give them a place to go.