Congratulations! Adsense is the only referral product I have not tried with Google. Was it a direct referral or did you have a website where someone signed up from?
It was a direct referral with a basic button. You should try these too, because nothing feels better than an extra $100. Or maybe two of them or three or ...
some times it takes ages for conversion, but it depends who knows a good website owner sign's up and then $$$
ahh mann.. congratulations... i've got lots of signups, but still 0 payouts.. that's a hard one to convert!