Here's a Rivals high-level look at the Big 10's draft results from '00 to '09:
Can we assume that the number of players drafted by the NFL is a reasonable reflection of the talent base? (I think we can, but I'll leave that to the reader.) If so, Ohio State's dominance the last few years becomes easier to understand.
I find it interesting that Wisconsin is right there with Michigan even when they've trailed them most years in the recruiting rankings. It's probably also fair to say that Northwestern has done some overachieving on the field.
Some detailed views (say, at the ultimate destination of 4-star offensive line recruits) would be revealing. Maybe later...