  We present updated colors for M and L dwarfs based on photometry from the
third data release of the Sloan Digital Sky Survey (SDSS). These data are
improved in quality and number from earlier results. We also provide updated
equations for determining photometric parallaxes from SDSS colors of late-type
stars. Walkowicz, Hawley & West (2004) have recently presented new techniques
for studying the magnetic activity of low-mass stars and their method relies on
an accurate determination of SDSS color. We derive new relationships between
SDSS colors and other common passbands and present updated formulas from
Walkowicz et al. (2004) for determining the level of magnetic activity in M and
L dwarfs.
