I found this yesterday via a friend of mine and I have to admit, it is a very cool tool to help grow your list, promote a product, the possibilities are pretty wide.
I'm not sure how long it's been around, but I've been using it since yesterday and I am impressed so far.... You have the option of making an outright purchase or putting it to the viral test and get it for free.
What is really nice is that from what I can tell, it will integrate with quality autoresponders like Aweber, to protect you from spam bogus spam complaints.
All you have to do is subsribe to their newsletter, confirm your subscription and get started yourself.
http://www.CommuteInYourJammies.com/listspawner.htm
Patty