Google Adsense Team has just revised the pricing for referrals in both Adsense and Adwords program, making these programs more rewarding.

Adsense Referrals

• 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).

Misc.

These rules will also apply to users that you have already referred but who have not yet reached one of the new earning/spend thresholds. For example, if you referred an AdSense publisher who has currently earned $2.00, you will be paid $5.00 if that publisher reaches the $5.00 mark. But, if you have referred an AdSense publisher who has already earned $10.00, you will not be paid $5.00 retroactively for that referral reaching the $5.00 mark. However, should that publisher eventually reach the $100.00 earnings mark within 180 days, you will be paid $250.00.

via inside adsense