Congrats aquapants....I know a few other schools give interview invitations before secondaries. The only one I know offhand other than Michigan is Vanderbilt, but I think maybe some school in Pennsylvania does as well.
As for the cutoff thing with Michigan, I heard a similar rumor last year when I was applying. I'm not sure how hard-and-fast a rule it is, but I do know that of my friends, those of us that got 33 or higher on the MCAT got interviews, and those that got 32 or below did not. I think that's pretty shady, but I couldn't control it....whatever. Michigan missed a lot of good people with their cut-off.