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UPDATE: On June 2008, the site is inaccessible and redirected to google.com
On late January 2008, YayClick.com is launched. Below are the details and review.
How: Click on ads and let them stay opened for half a minute. Get paid $0.005 - $0.01 per click.
Referral: Currently 100% commission on referrals. Seems like [...]

How many GPT programs are you registered with now? How long have you joined them? Did you notice that some of them were not as active as they had used to be? They didn’t flood your mailbox with tons of emails anymore, or there were way less ads to click…
Implementing selective first steps on choosing [...]

Some internet users and old hand bloggers might stay away from Get Paid To sites and think there’s no real income or business opportunity with them. They are nailed to the small pennies earned by reading a mail or clicking a single ad. They don’t realize that success comes to those who know how to [...]

How: Complete offers, free trials and surveys
Referral: 20% of level 1 and 5% of second level referrals
Payment: Via check, minimum payout $20 which can be obtained in less than a day
Upgrade: None needed
Pros:

Get paid to try out offers for free and keep them if we like
We can cancel them if we don’t and [...]

Companies offering free trials and paid surveys validate their subscribers using email addresses. They send validation link to our mailbox and we’ll have to click those links to make sure that we are the true owner of the email address. The problem is, most of the time, we’ll be sent offers and unsolicited email to [...]

How: Complete offers, free trials and surveys
Referral: 30%-50% of level 1 and 2 referrals
Payment: Via check, minimum payout $10 which can be obtained in less than a day
Upgrade: None needed
Pros: Proven sparkling reputation
Various offers to try, get paid to do so and keep them if we like!
Payout as low as $10, which can be reached [...]

How: Lots of ways!
Referral: Level 1: 5%, level 2: 4%, level 3: 3%, level 4: 2%, level 5: 1%
Payment: As low as $0.01 (e-gold) or $1 (PayPal and AlertPay)!
Upgrade: $5-$40 per year. Get free referrals!
Pros:

FREE membership, many ways to earn
Get paid never below $0.0025
5 referral levels of commission
Available internationally
Earn extra money playing [...]