ESPN has published out of conference schedules for Big 10 schools, and it ain't pretty:
Illinois: Missouri (St. Louis), Eastern Illinois, Louisiana-Lafayette, Western Michigan (Detroit)
Indiana: Western Kentucky, Murray State, Ball State, Central Michigan
Iowa: Maine, Florida International, Iowa State, at Pitt
Michigan: Utah, Miami (Ohio), at Notre Dame, Toledo
Michigan State: at California, Eastern Michigan, Florida Atlantic, Notre Dame
Minnesota: Northern Illinois, at Bowling Green, Montana State, Florida Atlantic
Northwestern: Syracuse, at Duke, Southern Illinois, Ohio
Ohio State: Youngstown State, Ohio, at USC, Troy
Penn State: Coastal Carolina, Oregon State, at Syracuse, Temple
Purdue: Northern Colorado, Oregon, Central Michigan, at Notre Dame
Wisconsin: Akron, Marshall, at Fresno State, Cal Poly
There are a total of just fifteen "respectable" opponents on this list. No one plays more than two respectable nonconference games.
Missouri for Illinois (normally an unimportant game, but this year both teams are good), Iowa State and Pitt for Iowa, Utah and Notre Dame for us, Cal and Notre Dame for State, Syracuse and Duke (nominally) for Northwestern, USC for Ohio State, Oregon State and Syracuse for Penn State, Oregon and Notre Dame for Purdue, and Fresno State for Wisconsin.
I've long complained about this watering down of our schedule. As before, it's easy to compare to USC, which is the model of difficult schedules:
2008: Virginia, Ohio State, Notre Dame
2009: San Jose State, Ohio State, Notre Dame
Commendably, the Pac 10 plays a complete round robin, so they have one less out of conference game. San Jose State is weak, but that's one poor game in two years.