A big theme from RailsConf a few weeks ago was the arrival of Rack in Rails as of version 2.3. The first topic that seemed to pique developer interest was Rails Metal -- especially the speed bump of using a lighter stack for high volume URIs. While this is a useful upgrade to Rails, the architectural shift provided by Rack brings new flexibility.
Read more about the value of mounting Rack middleware in your Rails stack: http://bit.ly/BNw6T
