Viral Sign Ups will allow you to easily create viral marketing campaigns to grow your email list through referrals.
Our easy to use wizard will guide you through setting up a campaign:1. Choose which type of opt-in form you wish to display and where; 2. Design your opt-in form; 3. Set up your rewards – i.e. Refer 5 friends and get xyz; 4. View detailed analytics; 5. Export your emails into MailChimp, Aweber or download as a csv.
via BetaList http://bitly.com/1VQirFp
Viral Sign Ups
by Robert Hughey (Google+)