  The Sloan Digital Sky Survey can be used to detect and characterize red and
reddened quasars. In Richards et al. (2003), we showed that 6% of SDSS quasars
have red colors consistent with significant dust reddening by an extinction
curve similar to that of the Small Magellanic Cloud (SMC). We estimate that a
further 10% of the luminous quasar population is missing from our
magnitude-limited SDSS sample. More recent work (Hopkins et al., in
preparation) confirms the conclusion that dust reddening is the primary
explanation for SDSS quasars in the red tail of the color distribution. Fitting
orthogonal first- and second-order polynomials to SDSS quasar photometry
measures the slope and curvature of each object's UV/optical spectrum. The
slope vs. curvature distribution is elongated along the axis predicted for
SMC-like reddening, while the axes predicted for LMC- or MW-like reddening
provide significantly poorer fits. Extension to longer wavelengths using a
smaller sample of SDSS/2MASS matches confirms this result at high significance.
