Front-page ads, long a taboo in the newspaper industry, may soon becoming to Dean Singleton’s Mercury News and Contra Costa Times. And his ANG papers, which have had a one-inch high strip of ads at the bottom of p1, may get more front page ads soon. That’s according to E&P, which quotes Coco Times publisher John Armstrong as saying: “We are exploring advertiser interest in various options for section front ads and Page One ads. We would like to get something done in the next few months.” How big will the ads on the front of the ANG papers become? “We expect it could be around two or three columns by five inches,” said Peter Wevurski, editor of the ANG papers (which include the Oakland Tribune, San Mateo County Times, Marin Independent Journal and Pleasanton Tri-Valley Herald.