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The Arecibo Legacy Fast ALFA (ALFALFA) Survey is a program aimed at obtaininga census of HI-bearing objects over a cosmologically significant volume of thelocal Universe. It will cover 7074 square degrees of the high latitude skyaccessible with the Arecibo 305m telescope, using the 7-beam feed L-band feedarray (ALFA). Started in February 2005, as of Summer of 2007 surveyobservations are 44\% complete. ALFALFA offers an improvement of about oneorder of magnitude in sensitivity, 4 times the angular resolution, 3 times thespectral resolution, and 1.6 times the total bandwidth of HIPASS. Although itwill cover only one quarter the sky solid angle surveyed by HIPASS, ALFALFAwill detect approximately six times as many sources, with a median depth of 110Mpc. Preliminary results of ALFALFA are presented, with emphasis on thoserelated with the Virgo cluster.

ALFALFA: an Exploration of the z=0 HI Universe