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The most historically important triple conjunction was that one between Jupiter and Saturn in 7 BCE-5 BCE, which has been proposed as the explanation for the star of Bethlehem. Triple conjunctions between Jupiter and Saturn -- so-called Greatest Conjunctions -- last took place in 1682-'83, 1821 (only in right ascension), 1940-'41 and 1981. It will not occur again until 2238-'39.
There are more frequent triple conjunctions of Jupiter with Uranus or Neptune. They are unspectacular, but offer a good possibility for amateur astronomers to find these dim planets. The next triple conjunction between Jupiter and Uranus will be in 2010-'11 and the next between Jupiter and Neptune will be in 2009.
sorry for the wikipedia source but it is interesting