This morning I wrote (http://news.ycombinator.com/item?id=1375009)

  And the Rails Tutorial book (http://www.railstutorial.org/)
  has again been updated:

    s/2\.3\.6/2\.3\.7/

  I hope this doesn't start happening every day. :-)

Turns out that was wishful thinking:

  s/2\.3\.7/2\.3\.8/

Get it while it's hot: http://www.railstutorial.org/book