When someone makes $100? Should it not be when that someone spends $100?

Or is it based on conversion tracking? :)

It's aviable since 03/10/06, no?
http://www.zorgloob.com/2006/03/parrainages-google-adwords.asp

Thanks Ulf, corrected.

Tomhtml: Not in every country. For example, in Switzerland, it wasn't available 'till today.

Thanks for the information about "AdWords Referrals." Sometimes, something
is right before your eyes, but you can't see it till someone points it out to you.
I have used adwords many time and did not know about the referrals.
I hope I can make some money from this. Google Adsense is good also.
www.e-marketreview.com/newsub