#1  Craving Cash Craving Cash is a newer free survey site that offers a generous 3 tier referral system. What that means is you could get paid 4 times for the same survey. They offer lightning fast pay outs within 24 hours via Pay Pal and checks. They also offer a $3.00 sign up bonus and you can request a pay out anytime you want as long as you have at least $10.00 in your account! I have requested over 10 pay outs via Paypal with them so far and ALL payouts were right on time! 

They have the Fastest Payouts I have ever seen! Request a payout and you will get it in your Paypal account in less than 24 hours!
 Join Craving Cash Free

The amazing thing about work at home programs with referral systems is that once you set it up you really can just sit back and watch your earnings grow if you want to. Of course the harder you work at it the more money you will make!

#2  Cash Crate Cash Crate is one of the best FREE Paid Survey sites out there. I have been a member there for over two years. My first month I completed a few surveys to try it out and I made $12. After I received my first check I realized this company was for real so I started putting more effort into it. They have an excellent referral program. You can get paid 3 times for the same survey. Let me explain.
Let's say you complete an offer worth $1.00

One of your referrals completes the same offer and you get paid again

One of their referrals completes the same offer and you are paid a third time!

Don't get discouraged about a survey that pays less than $1.00 instead look at the bigger picture, what if you recruited 10 people and all of them completed that $1.00 or even $5.00 offer? See why having a referral system is a must with these programs?
There is plenty of money to be made with these paid survey sites once you understand how the referral system works.
Cash Crate pays out the first of every month with a check or direct deposit. They are a U.S. based company so more offers will be available to U.S. members. Once you earn over $600 you will have to complete tax forms, they are a legitimate company and my payments have always been right on time. Minimum payout is $20.

CashCrate really is a great Survey program, I signed up my 14 year old nephew and taught him how to recruit people for cashcrate and while he has gotten lazy and not lifted a finger for the last 3 months he still makes $75 - $120 a month because of the referral program. For a teenager that is a lot of extra money a month to shop with. He always has a big smile on his face when he shows me his check, " Look how much I made and I didn't even do anything this month" - staying true to his age I think he is proud of being lazy? :) He could make more if he would put more effort in but he is happy with that amount and that's ok.  Join Cash Crate Free

I forgot I joined this survey site until I received my first check from them on May 24th, 2010, they do payout and are legit! Not as high paying as the other 2 survey sites mentioned above but the more sites you join the more money you will make as they all have different surveys so go for it.