As of the end of the 2011 season,
The NY Yankees have won 27 World Series, the NY Giants have won four Super Bowls, the NY Jets have won one Super Bowl, the NY Knicks have won two NBA finals the Mets won twice, the Islanders won four times and the Rangers won four times.
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The New York Yankees have won 27 world championships.
The New York Islanders have, I don't know about any others
The Yankees have won the most championships in sports. They have won 27 World Series. The Lakers have won 16 NBA championships.
Yogi Berra appeared in 14 World Series as a player for the Yankees and won 10 championships. Yogi also won 2 World Series championships as a Yankees coach in 1977 and 1978.
The Knicks have won two NBA championships: 1970, 1973.