Mediaqueries is a phenomenal resource for not only surveying many of the different Responsive Web Designed sites by order of listing or order of popularity from the Mediaqueries community; it is a open framework for designing a Responsive web site.  The philosophy has been based on a combination of different break-points for different device types and screen resolutions.  Besides Mediaqueries there are now a lot of frameworks out there to develop Adaptive or Responsive Websites.

We will continue to put some of the tools we find useful as a reference: