Can someone explain why this was downvoted? People are staying ion 1.8.6, not 1.8.7 (though some are moving there).

1.8.7 is being developed; 1.8.6 is in maintenance mode by way of EngineYard.

http://redmine.ruby-lang.org/

    * Ruby 1.9 - Edge version of Ruby
          o Ruby 1.9.1 - The latest stable release of Ruby 1.9 series.
    * Ruby 1.8 - Stable development version of Ruby
          o Ruby 1.8.6 - An ancient stable release of Ruby that Rails users love
          o Ruby 1.8.7 - A stable release of Ruby for bridging a gap between the 1.8 and 1.9.
    * Ruby - Version-independent topics