  We have undertaken a survey for blazars by correlating the ROSAT WGACAT
database with publicly available radio catalogs, restricting our candidate list
to serendipitous flat-spectrum sources (alpha_r <= 0.7). We discuss here our
survey methods, identification procedure and first results. Our survey is found
to be ~ 95% efficient at finding blazars, a figure which is comparable to or
greater than that achieved by other radio and X-ray survey techniques. DXRBS
provides a much more uniform coverage of the parameter space occupied by
blazars than any previous survey. Particularly important is the identification
of a large population of flat-spectrum radio quasars with ratios of X-ray to
radio luminosity >~ 10^-6 (alpha_rx <~ 0.78) and of many low-luminosity
flat-spectrum radio quasars. Moreover, DXRBS fills in the region of parameter
space between X-ray selected and radio-selected samples of BL Lacs.
