* San Francisco "conceptual artist" Guy Overfelt, 29, was prominently, if not favorably, reviewed for two recent projects: For a show at the Refusalon gallery in San Francisco, he called 2,000 toll-free numbers to request that information be sent to the gallery. (That's it.) For a show at New York City's White Columns Gallery in the winter, he exhibited two 1,000-name mailing lists of art collectors, one for the East Coast and one for the West Coast. (Overfelt offered for sale a "signed" edition of the mailing lists, on PC and Mac diskettes, for $20 each.)