SERENDIP is an acronym for “Search for Extraterrestrial Radio Emissions from Nearby Developed Intelligent Populations”, and like SETI@home, SERENDIP searches the radio band for potential signatures of ETI. Although SERENDIP does not analyze data to the same level of detail as the computing power of SETI@home allows, it scans a broader range of frequencies. The data used in SERENDIP is currently taken using the Arecibo L-band Feed Array (ALFA) on the Arecibo radio telescope in Puerto Rico.
Planetary Society's excellent article on SETI@home and SERENDIP V.v.
CASPER's technical description of the SERENDIP V.v instrument system.
Jeff Cobb et al. 1996 SIREN Conference Paper on SERENDIP IV.
Jeff Cobb et al. SERENDIP IV Data Acquisition Reduction and Analysis Paper.
Dan Werthimer et al. "The BERKELEY SETI Program, SERENDIP III and IV Instrumentation"Progress in the Search for Extraterrestrial Life, ASP Conference Series 1995
Dan Werthimer et al. "The SERENDIP II Design" IAU Conference Proceedings, 1985.