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 has been updated recently (June 11, 2008). The not so good news is that there is little change from a year ago in terms of what is compatible and what is not.