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A single-slope "Salpeter" IMF overpredicts the stellar M/L ratio of localelliptical galaxies by about a factor of 2, which requires the IMF to beflatter below about one solar mass. On the other hand a Salpeter IMF for starsmore massive than the sun predicts an evolution with redshift of thefundamental plane of ellipticals in clusters which is in agreement with theobservations and a formation at z>~3 for these galaxies. A "Salpeter" IMF for1<M<40 solar masses also predicts the observed amount of heavy elements (oxygenand silicon) in clusters of galaxies.Comment: 10 pages, 7 figures, to appear on "IMF@50: The Initial Mass Function  50 Years Later", ed. E. Corbelli, F. Palla, & H. Zinnecker (Dordrecht:  Kluwer), in press. Invited talk at the International Workshop held in Abbazia  di Spineto, Tuscany, Italy -- May 16-20, 200

Steeper, Flatter, OR Just Salpeter? Evidence From Galaxy Evolution and Galaxy Clusters