Surveys and the Blazar Parameter Space
  The rareness of blazars, combined with the previous history of relatively shallow, single-band surveys, has dramatically colored our perception of these objects. Despite a quarter-century of research, it is not at all clear whether current samples can be combined to give us a relatively unbiased view of blazar properties, or whether they present a view so heavily affected by biases inherent in single-band surveys that a synthesis is impossible. We will use the coverage of X-ray/radio flux space for existing surveys to assess their biases. Only new, deeper blazar surveys approach the level needed in depth and coverage of parameter space to give us a less biased view of blazars. These surveys have drastically increased our knowledge of blazars' properties. We will specifically review the discovery of ``blue'' blazars, objects with broad emission lines but broadband spectral characteristics similar to HBL BL Lac objects. 
E. S. Perlman (U. of Maryland), P. Padovani, H. Landt (STScI), J. T.   Stocke (U. of Colorado), L. Costamente (Oss. di Brera...