It's not all luck. Instead of a Babe Ruth or a Lou Gehrig who can carry a team, they have a whole lineup of hitters who nick away with singles and doubles. These Yankees don't make a lot of errors in the field or on the basepaths. Roger Clemens gave up only two hits while striking out nine in eight shutout innings in Game 2. Last year in Game 1, four Yankee pitchers combined on a two-hitter.
Baseball is a game of continuity, threads reaching across time.
After Ruth and Gehrig departed, Joe DiMaggio's Yankees won 10 straight in the World Series in 1937, '38 and '39. The only other team to come close was Cincinnati, when the Big Red Machine won four straight in 1976 after taking Game 7 in 1975. The game keeps changing, going through periods of power hitting and power pitching, but one thing that doesn't seem to change much is the Yankees' winning tradition. And right now, Torre's Yankees can claim they are the best ever.