In case you're wondering about other code review statistics:
The 1.18 revision report https://secure.wikimedia.org/wikipedia/mediawiki/wiki/MediaWiki_roadmap/1.18... mentions 62 new revisions that need some action. The data behind Rob's chart at http://toolserver.org/~robla/crstats/crstats.118all.html says it's more like 73. But the revision report subtracts out several that are tagged no-deploy and the like. So it's accurate enough for our purposes.
Glancing away from commits for a moment: it's pretty easy to check on the number of unreviewed patches in Bugzilla via the needs-review keyword. That number right now is 478. I heartily welcome and encourage any coder to visit a few of those issues, see if the patch applies cleanly to current trunk, and give the original submitter some feedback.
https://bugzilla.wikimedia.org/buglist.cgi?keywords=patch%2C%20&query_fo...