The March 2010 "Best of the Web" column of the IEEE Signal Processing Magazine presents online radar reflectivity databases, which are free of charge to the international research community. Databases such as these are used for the characterization of interference (including noise, sea clutter and land clutter, among others) in radar systems, and the development of signal processing techniques that reduce the detrimental effects of this unwanted interference. The data can also be used for the development and evaluation of signal processing techniques aimed at detecting and tracking man-made objects by separating targets from interference based on Doppler and amplitude characteristics. These signal processing techniques include moving target indication, pulse-Doppler, space-time adaptive processing, track-before-detect, and constant false alarm rate processing. Learn more from the column article by H.J. de Wind, J.C. Cilliers, and P.L. Herselman.