The St. Louis Cardinals formally introduced Mike Matheny [[ mah-THEE-nee ]] as their new manager today.  Matheny replaces Tony La Russa, who retired just days after the Cardinals won their 11th World Series championship.  The 41-year-old Matheny has no prior managerial experience, but had been working in the St. Louis organization as a special assistant in player development.  Matheny is a four-time Gold Glove winning catcher who spent 13 seasons in the major leagues with the Brewers, Blue Jays, Cardinals and Giants before retiring in February 2007.