If you guys go to this page:
http://fineartphotogifts.com/shop/customer/product.php?productid=16140&cat=256&page=1
you will see the second box under the thumbnail is "Tell Your Friends."
Others have done this before, and the code is on these boards somewhere.
But if you're interested in this one, then let me know, and I'll post all the stuff you need.
WHY IS THIS DIFFERENT? Because it LOGS in a DB table all the emails that are going out. It logs the senders email address, the recipient's email address, the page that was sent, the timestamp, and the message that was sent, if any.
Some people may not agree with this, and you do what you want with this information.
The original idea was mine and the code was done by a guy I work with for our corporate site (work), so I cannot take credit for it. But I modified it ever so slightly and made it work with my site.