Excellent list, but one error.
The Atlanta Braves lost the World Series in 1991 and again in 1992. They finished last in 1990, as did the Twins, who beat them in 7 the next year.
The list is larger than expected, and losing two in a row isn't even a record:
Chronologically -
Detroit Tigers lost 1907, 1908, 1909 for three in a row
NY (now SF) Giants lost 1911, 1912, 1913 for three in a row
NY Yankees lost 1921, 1922
NY (now SF) Giants lost 1923, 1924
NY (now SF) Giants lost 1936, 1937
Brooklyn (now LA) Dodgers lost 1952, 1953
NY Yankees lost 1963, 1964
LA Dodgers lost 1977, 1978
Atlanta Braves lost 1990, 1991
Texas Rangers lost 2010- 2011
So the numerical answer is 10 teams (through 2012) will have lost two or more consecutive World Series. (But watch out for a "bar" bet where the Tigers would be counted twice for 1907-08 and 1908-09 as also would the Giants for 1911-12 and 1912-13.)
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No teams in the NBA have ever come back from a 3-o series deficit in any NBA 7 game series including the Finals.
Jackson played on back-to-back world championship teams with the New York Yankees in 1977 and 1978.
Five teams have done it in a seven-game World Series: 1925 Pirates 1958 Yankees 1968 Tigers 1979 Pirates 1985 Royals The Boston (AL) team also won the Series in 1903 after being down 3-1, but that was a nine-game series.
Only three teams-Boston in 1969, Portland in 1977 and Miami in 2006-have overcome an 0-2 deficit to win the title.
Two: The 1942 Toronto Maple Leafs came back from a 3-0 deficit to defeat the Detroit Red Wings to win the Stanley Cup. In 1975, the New York Islanders came back from a 3-0 deficit to defeat the Philadelphia Flyers in the Eastern Conference semifinals.
No team has ever come back from a 3-0 deficit to win the World Series.
There were no teams ever came back from 3-0 deficit. There were some who forced a game 7 though. However, there were 7 teams to win a playoff series from 3-1 deficit.
Pittsburgh Pirates and Baltimore Orioles. Pirates became world champions by winning game 7 and coming back from a 3 game to one game deficit.
No teams in the NBA have ever come back from a 3-o series deficit in any NBA 7 game series including the Finals.
Montreal Canadiens came back from a 3-1 deficit in 2010
No team has ever come back from a 3-0 deficit to win the World Series.
No team has ever come back from a 3 games to none deficit to win the World Series.
It has never happened in World Series history.
Probably not in 2012. It's hard to come back from a 4 games to none deficit.
The Pittsburgh Pirates came back from a 3-to-1 deficit to beat the Baltimore Orioles in seven games.
The New York Yankees, who came back from a 3 games to 1 deficit against the Milwaukee Braves.
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