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A decade is ten years. The end of 2009 will mark the end of the 00s because the 00s began in 2000. Just like the 80s ended at the end of 1989 because they began in 1980. 1980 was not part of the 70s.
It was, however, the end of the decade that began on January 1st, 1971. This is what Rob is trying to say. Since the beginning of the calendar, every ten years has ended in a zero. So the year 11 was the beginning of a new ten years, as was the year 21 or the year 1981.
In short, people are arguing about two dfferent things. A decade is ten years. 2009 will be the end of the 00s but it will not be the end of the decade that began on january 1st, 2001. That will happen on January 1st, 2011.
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