Quick & easy loading of useful libraries

Respond

(Comes packed with mothership)
Makes old versions of ie understand the mediaqueries
https://github.com/scottjehl/Respond
!important: Only works when css cache is activated :(

Selectivizr

Loads the Selectivizr project to help getting old versions of IE to understand what the world should look like.
It’s loaded from a CDN so we don't have to carry it around.
As you can see on the project's website Selectivzr does not fix all your problems for advanced CSS selectors. Try jquery extended selectors to boost selectivizr with jquery.
http://selectivizr.com/
!important: Only works when css cache is activated :(

Modernizr2

This will load Modernizr2 with all its glory from a CDN
!important: This works perfectly fine in a development environment but in a production environment you should really make a custom build of modernizr with only the features that your website needs (the front-end performance gods will love you for doing this).
http://modernizr.com