Without elaborating much, I think the following could make great stories for this series:
1. Tiger Woods - I guess this story is far from over, but what a story it's been. To dominate his sport unlike anything we've really seen and then to fall so fast... I think it'd be interesting.
2. The BCS - I guess ESPN could never really do this one though, right?
3. Duke basketball/Coach K - I'm biased here, but you could change it to something else. Penn State? Florida State? Any successful program and its longtime coach would be good to me.
4. OJ Simpson - Like his car chase and his court case... I'd probably watch it. (I guess the car chase was covered in that one episode though. I haven't watched it yet, so I don;t know how much it goes into the OJ stuff.)
5. New Orleans Saints and Hurricane Katrina - We wrote tons about this here on our site during last year's Super Bowl run. There's a definite story here.