I love the new mobile friendly email newsletter templates that Sitepoint has created. The design must be responsive since the same emails display well on both a computer screen and a mobile device, but I'm wondering how. Though you can manipulate css with @media I don't see how you're changing html attributes. Are you using javascript for this? This would be a fantastic subject for a article! Is it possible to get some enlightenment on your techniques?

Cheers
Jules