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