As the free agent signing period began in earnest Sunday, the Giants have intensified their discussions with Jeff Borris, the agent for Barry Bonds, about the possibility of the slugger returning to San Francisco in 2007 to play his 15th season in that uniform. The last discussion between Borris and Larry Baer, the Giants' vice president and chief operating officer, occurred late last week. "The talks are moving forward," Borris said when reached by phone in Los Angeles on Sunday, adding that there had been no further negotiations between the two sides this weekend. A source close to the negotiations said the Giants have made their first offer, although neither Baer nor Borris would confirm such an occurrence. "The dialogue is continuing," said Baer, when reached in San Francisco on Friday.