[rodriguezcommaj]

The Zurb one is a cool start - you may also like Antwort - http://internations.github.io/antwort/ - and Brian Grave's Responsive Email Patterns - http://briangraves.github.io/ResponsiveEmailPatterns/

For general information, Anna Yeaman over at STYLECampaign made an amazing video on Responsive Email Design, a must-view if you're interested in the topic - http://stylecampaign.com/blog/2013/03/responsive-email-desig...

Shameless self promotion, I also wrote a book on the subject called Modern HTML Email - http://modernhtmlemail.com - good way to get into responsive email design and email marketing in general.