New York—Ad spending in b-to-b publications was up 3.8% in 2004, according to the Business Information Network report by American Business Media and IMS/The Auditor. B-to-b ad pages were up 1.4%. Ad spending rose 4.6% in December, compared with the year-earlier month, and ad pages were up 2.7%. The leading gainers in ad spending for 2004 were retail (up 13.1%), automotive (up 8.2%) and telecommunications (up 7.1%). In ad pages, the leaders were telecommunications (up 9.2%), drugs and toiletries (up 6.4%), and business and advertising (up 3.1%).