In this article that goes hand-in-hand with the release of Emails-Standards.org, David Greiner explains what you need to do to ensure that your emails not only look great in today’s email clients but also actually make it to where they’re going.
Very informative article and it’s great to see the Email Standards Project is a reality. Concerning using inline CSS to code your emails, I’ve found Premailer to be a very useful tool for that.