I'm just going to leave here some of my CSS Good Practices bookmarks:

* https://github.com/necolas/idiomatic-css

* http://coding.smashingmagazine.com/2009/04/08/from-table-hel...

* http://engineering.appfolio.com/2012/11/16/css-architecture/

* http://www.stubbornella.org/content/2011/04/28/our-best-prac...