The Sloan Digital Sky Survey is a five year survey of the North 
Galactic Cap using 5 filters and two spectrographs. Imaging data is 
used to estimate the type of each object observed, then various 
selection processes are used to pick objects for follow-up 
spectroscopy. The resulting catalogs will contain about 200 million 
objects, of which 1 million will have spectra. About 20% of the sky 
will be covered twice, so we have excellent data on calibration and 
systematic errors. For instance, absolute fluxes are determined to 1% 
accuracy, when enough photons are obtained to make such small errors 
possible. The survey is nearing the half-way point, 5% of the data 
are public and another 15% will become public in February 2003. Many 
areas of astronomy have already been impacted by the availability of 
statistically well-defined data sets. I will discuss, in particular, 
new results on the nature of quasi-stellar objects, on the character 
of galaxies and the time of their origin, on the distribution of 
stars in the Galactic halo and on the nature of the faintest stars.