Google Adsense Bonanza

You don't see any adsense referrals on this site - the reason ofcourse is that Adsense referrals hardly generate any revenue.

Google has changed that now,

For Adsense

• When a publisher who signed up for Google AdSense through your referral earns their first $5 within 180 days of sign-up, you will be credited with $5.
  
• When that same publisher earns $100 within 180 days of sign-up and is eligible for payment, you will be credited with an additional $250.
  
• If, in any 180-day period, you refer 25 publishers who each earn more than $100 within 180 days of their respective sign-ups and are all eligible for payout, you will be awarded a $2,000 bonus (bonus payouts are limited to 1 per year).

AdWords Referrals:

• When an advertiser you refer spends $5 within 90 days of sign-up (in addition to the $5 sign-up fee) you will be credited with $5.
  
• When that same advertiser spends $100 within 90 days of sign-up, you will be credited with an additional $40.
  
• If, in any 180 day period, you refer 20 advertisers who each spend more than $100 within 90 days of their respective sign-ups, you will be awarded a $600 bonus (bonus payments are limited to 1 per year).

Via Adsense Blog