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Agree 100%, I think this should be included by default, since you can change titles or mistype links and end up with duplicate content, e.g.

http://www.question2answer.org/qa/2372/feature-request-canonicalization
and
http://www.question2answer.org/qa/2372/blah-blah-blah

By the way, you can add this yourself fairly easily using an advanced theme, see my answer here:
http://www.question2answer.org/qa/1153/description-meta-keywords-front-page-then-related-questions#a1642
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