It's a link referral site called LinkReferral. It's a pretty decent way to get your site noticed. It takes a little work, but it's free!
Here's the referral letter
Hi, I'm sending you this e-mail from LinkReferral.com because I've just registered for their social networking program for webpage owners to get more visitors to my webpage. It's good for anyone/any business with a blog, website, personal page or affiliate link. Check it out,
You'll see my page is listed in the 'featured sites' section. If you decide to register you'll be under me as my referral/friend.