Almost everyone has expressed interest in sending HTML formatted email newsletters.  Almost everyone is skittish about how such emails will look in various email clients-- for good reason.  At past Lab Hours sessions I've alluded to an online guide to CSS compatibility within various email clients, both desktop and online.  The good news is I'm finally posting this guide.  The better news is that it is updated regularly.

Here is the link:  http://www.campaignmonitor.com/css/