Refine your search with cuil

A new search engine with categories.
http://www.cuil.com/

Example a search on rails suggests these categories:

    * Ruby Programming Language
         o Ruby on Rails
         o RadRails
         o Ruby
         o Mongrel
         o WEBrick
   * Free Integrated Development Environments
         o RadRails
         o Aptana
         o EasyEclipse
         o NetBeans
   * Extreme Programming
         o unit testing
         o Dave Astels
         o regression testing
   * Free Development Toolkits And Libraries
         o Ruby on Rails
         o CakePHP
         o wxPython
   * Software Architecture
         o web application
         o bootstrapping
         o Representational State Transfer
   * Database Management Systems
         o ActiveRecord
         o foreign key
         o IBM DB2
         o OpenBase
   * Object-oriented Programming Languages
         o Ruby
         o C Sharp
         o Jython
   * Software Testing
         o unit testing
         o debugging
         o regression testing
   * Towns In South Dakota
         o Bradley
         o Raymond
         o Stockholm
   * Computer Programmers
         o Dave Thomas
         o Thomas Fuchs
         o programmer