When first loading the front page of http://www.metafilter.com/, the main page content is printed after the end of the right-justified sidebar. Hitting 'Refresh' draws the page as expected.
<rdar://problem/6677470>
This bug appears when a logged-in user to metafilter.com chooses the "Plain" theme in their profile settings. Seems to happen about 50% of the time, hitting 'refresh' a few times will cause it to happen periodically.