The Spitzer Space Telescope has been returning data for ~1.5 years now,
with a wealth of results being assembled on circumstellar disks in all stages of
evolution around pre-main sequence and main sequence stars (and brown dwarfs).
This talk will review published studies on imaging and
spectroscopy of disks, and will present new results from the FEPS
(Formation and Evolution of Planetary Systems) Spitzer Legacy program.
FEPS is obtaining spectrophotometric observations in the mid-infrared
of a sample of ~330 representative solar-type stars ranging in age from
$\sim$3 Myr to ~3 Gyr. This program will trace the evolution of
circumstellar dust from primordial planet-building stages in young gas-rich
circumstellar disks through to older collisionally regenerated debris disks.
Our goal is to compare the evolutionary path followed by our solar system dust
with the statistics on dust evolution inferred from observations an ensemble
of other stars.