GaMerZ has written a great plugin called Email This that provides a great way for viral marketing of your site, your products, or your services. Here’s a help video that shows how it’s used with BNI Embarcadero to refer a fellow member.
About the Author: Bradley Charbonneau
I've done the big corporate thing. I've done the creative writer thing. Now I'm happily in the middle. I like to help small businesses who are interested in "working their website before their website works them." I'm also interested in creating beautiful sites with powerful WordPress themes. Google+