As of the 2011 season, the Cardinals have played in 17 World Series. They have won 10 Series and lost 7. If they win the 2011 World Series, they will have played in 18 and won 11.
The yankees have them beat by quite a few 
The Texas Rangers have played in two World Series: 2010 and 2011. The 2010 World Series was the first for the Texas Rangers franchise.
Above from wiki 
However it end it's been a great series.
HL