The Steelers signed former Ravens quarterback Troy Smith on Friday, according to The Pittsburgh Post-Gazette. This is an interesting addition but not likely a significant one, even though the Steelers' quarterback group could undergo change, Smith would be fighting for the No. 3 job. Pittsburgh's top two backups this season, Charlie Batch and Dennis Dixon, are both free agents, Dixon presumably will go elsewhere and the 37-year-old Batch might not return. Byron Leftwich, who is also a free agent, is expected to re-sign and become the primary backup to Ben Roethlisberger. Leftwich broke his arm in the preseason and spent the entire regular season on injured reserve.