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Having been requested by Jimmy to do so, and having seen a fun rumor of
a "search engine optimization world championship" contest targeting
WP, I've gone ahead and switched rel="nofollow" back onto URLs in
en.wikipedia.org's article namespace.
(Better heuristic and manual flagging tools for URLs would of course be
super; anyone interested in working on integrating such support into
MediaWiki should swing on by the tech channels and give a shout.)