Custom variables are one of the most powerful features in Google Analytics. “With them you can segment traffic by almost any attribute. For e.g., you could compare traffic from first-time customers versus repeat buyers. Or, if you run a content-oriented site, you could see which authors produce the most traffic. While powerful, setting up custom variables can be a bit tricky, so Google is holding a webinar on March 24th, at 10:00 AM Pacific, for you to learn how to make the most of them. Registar here, and vote the questions you’d like to see answered using Google Moderator,” noted Google.