I came across this while reading Google's recent Adsense Newsletter - Tips for successful referrals: I've only shown 3 tips here - click on the link above to read all 6... Cryo.
I use the adsense refferals and 6 accounts signed up through me, lets see when they got their first $100
very helpful information and nice examples. In the past I tried some Google referrals with not much luck.
I don't make much with referrals, but because I place them in addition to my other AdSense blocks, it is still more than if I didn't have them.