Nebraska blog HuskerExtra created a map of Big Ten country recruiting. Every state's top five talents (according to Scout) are listed with the schools they committed to, and the top ten are all included to calculate a states "leave rate". They also go school-by-school to the class rankings by both Rivals and Scout, breakdown of the class by stars, and a little commentary. Also included are in-state roster numbers by school (Michigan 52, Sparty 64).
Edit: Messed this up, here's the correction:
Michigan (the state of Michigan) is pretty good when it comes to keeping talent in-state with just 40% leaving. That's third best in the Big Ten, behind Iowa and Ohio Surprisingly, Nebraska is second to last, 52.8% of the top ten in-state recruits this year left the state.
They go on to list Nebraska players from Big Ten country and where they were recruited out of.
Overall I thought it was very informative and something (almost) different from our discussions the past six weeks. I would embed the pic, but it's huge and when I got it down to size it was illegible. Sorry for having to link.
(I searched HuskerExtra, Nebraska map and Nebraska and got no MGoResults, plus I hadn't seen it so I'm pretty confident this hasn't been posted, sorry if it was.)