Off the top of my head:
Mike Ditka (we all know how that went).
Mike Holmgren (Packers (SB) - Seahawks)
George Seifert (49ers (SB) - Panthers)
Mike Shanahan (Broncos (SB) - Redskins)
Jimmy Johnson (Cowboys (SB) - Dolphins)
Bill Parcells (Giants (SB) - Patriots/Jets/Cowboys)