The NCAA toughest schedule rankings are here (pdf). UMass was ranked 9th in overall schedule toughness in 2007 based on the results of its opponents.
Some interesting results there.
The San Diego Toreros fans were furious that they did not get an at large bid. Their schedule rank---98 out of 110 FCS teams.
Everybody was surprised at undeafeated McNeese State's losing in the first round of the playoffs. Their schedule rank----107 out of 110 teams.