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The Spitzer Space Telescope began routine scientific operations in
December, 2003. Spitzer now operates around the clock at ~90%
efficiency, returning unprecedented images and spectra at infrared
wavelength from 3-to-180um. These two years' results show that the
scientific impact of Spitzer will be profound. This talk presents
highlights of these first two years of the mission, focusing on solar
system and galactic astronomy with a sprinkling of extragalactic
results. Solar system/galactic topics to be addressed include star
formation, protoplanetary disks, debris disks, Kuiper Belt objects and
comets, brown dwarfs, and extrasolar planets, with a few additional
surprises thrown in. The extragalactic discussion will include the
relationship between the x-ray and infrared properties of AGN and
surprising results on the most distant known galaxies.
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