One area of e-mail real estate that is often overlooked is your e-mail signature file.  Do you have one?  Think about it, how many times have you followed a link in a signature file?  Plenty I’m sure.  You’d be amazed how effective this stategy is.  Believe it or not, people follow these links.  I have one and change it several times a year, depending on what we’re doing or promoting or what books I have coming out.  I’ve taught many of my clients to do it too and it’s worked remarkably well.