Many of my ideas come from the following:
http://thesassway.com/intermediate/responsive-web-design-part-2
https://gist.github.com/1215856#file_6_media_queries.scss
http://rubydoc.info/gems/responsive-sass/0.1.1/frames
https://github.com/jonikorpi/Golden-Grid-System/blob/master/GGS.css
http://jonikorpi.com/leaving-old-IE-behind/
https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS%20Guidelines.md
https://github.com/twitter/bootstrap/blob/master/less/responsive.less
https://github.com/csswizardry/inuit.css
http://elliotjaystocks.com/blog/a-better-photoshop-grid-for-responsive-web-design/