Triple quoted strings in Boo are used to preserve spacing and linebreaks without a thick slathering of \n's all over your precious code.
It is good for visually representing XML, for instance:
It is also most excellent for formatting console output:
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Hide/Show CommentsFeb 17, 2008
FrozenCow
It should be noted that string-escaping will not work within triple-quotes, like this page does: http://boo.codehaus.org/Part+02+-+Variables#Part02-Variables-CharactersandStrings