31-year old offensive tackle Marvel Smith has decided to hang up his cleats.  He played in 5 games (all starts) for the Steelers last season.  Smith finishes his career playing in 111 games (108 starts) in his NFL career in which he helped the Steelers win two Super Bowls.  This hurts the Niners as he was projected to be the starting right tackle in 2009.  Adam Snyder will likely take over Smith’s spot this season and that is a downgrade.