Here are some interesting numbers (2006-7) listed most to least:
Assistant professors: Caltech $99K, UPenn $92K, Harvard $91K, Stanford $91K, MIT $89K, UChicago $85K, Northwestern $84K, Princeton $79K, Rice $78K, Yale $78K, Berkeley $76K, UTexas $75K, UCLA $72K, TAMU $67K, Rockefeller $67K. | Associate professors: Stanford $115K, Caltech $111K, UPenn $106K, Princeton $105K, Harvard $100K, MIT $100K, UChicago $98K, Northwestern $98K, Rice $91K, Rockefeller $90K, Berkeley $87K, Yale $87K, UCLA $84K, UTexas $78K, TAMU $76K. | Full professors: Rockefeller $186K, Harvard $177K, Stanford $164K, Princeton $164K, UChicago $163K, Yale $158K, UPenn $157K, Caltech $156K, Northwestern $147K, MIT $146K, UCLA $133K, Berkeley $131K, Rice $130K, UTexas $121K, TAMU $107K. |
It looks like private institutions pay a lot higher than the public schools. Texas A&M scored last in all three levels but college station, tx is kind of like a place where you cannot spend much money anyway.