Fummo are set to launch on 20th May. prior to launch they have said that any referral you sign up will credit your account with $5 and on 20th May, the day the site launches, they will payout. I have 114 referrals so stand to get $570. I am not sure how they will be able to afford to pay out, but I figure it is worth a push at trying to get last minute referrals just in case they do pay out.
Might seem a bit risky but at $5 a pop it is a risk that I am willing to take.