I see there are mods already for a "Tell-a-friend" email to send a link to your site to someone. I was wondering if there was a mod out there that did this AND kept track of who sent who.

Would this be done with a key of some sort in the email link that gets emailed to the recipient? (like the reg email one gets when they register?)

I am just looking to see who recommends the most new members and to keep track of how many of these referrals actually come by and sign up. Any ideas?<