No, I haven't heard of this one yet -- you might want to wait it out a bit or check it out to make sure it is not some sort of a scam...about a year ago there were two legitimate research surveys going on...we all were contacted at about the same time -- one paid $25 and the other paid $50...I recall getting the money and most others reporting they got theirs as well.
How was the contact made? Email - regular mail - phone???