I was paid by Valued Opinions.  They would have rated an "A" grade  (their surveys pay great, usually about $1.00 per 10 minutes) except for two things:
1) You have to keep track of your "pending earnings".  It can take up to 4 weeks for it to actually show up on your balance.  Plus, I had a couple of pending earnings disappear.  But as soon as I contacted them, I was credited. 
2) You have to have $20 to cash out plus the reward options aren't the best.  Right now, you CANNOT get cash.  You have to choose a gift certificate from Amazon, Blockbuster, Macys, Marriott, Frangrencenet, or Magazines.com. 

Link to join: ValuedOpinions.com

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I've changed the grades for MySurvey.com and Lightspeed Panel from "A's" to "B's".  They lowered how much their points are worth by a little bit and surveys are getting longer and longer while points rewarded are either staying the same or getting smaller.  I very rarely get a survey anymore that meets my minimum requirements, which is $1.00 for every 10 minutes (or 15 minutes, if I'm feeling generous).  I've actually gotten some that only pay $1.28 for 30-35 minutes.  Of course, I don't do those surveys.