Adding a "Mail this to a friend" feature is something that @Trish has been asking me to do but I haven't gotten to it, yet. For now, I guess you could copy the web address into an email to them, but I admit that's a pretty old fashioned method.
I don't think we ever had that here. But yes, I need a "Share this Idea" type feature which will let you either mail it, tweet it, facebook it, and anything else we want.