i have really grown fond of this site. tons and tons of survey invites, a free points earning poll each weekday, a decent referral program, points even if you don't qualify and opportunities for online focus groups----mintvine offers all of it. easy paypal payout option at only $10 too!
the only negative i find is that i get inundated with emails, sometimes 20+ a day--yet when i click on the link the majority of them are already closed--even when i immediately jumped on the invite. that can be a bit frustrating but i still prefer getting all the opportunities. i also score quite a few Invoke interactive sessions through them which usually payout $35.
just don't forget to visit them daily to see if they are offering an easy one question point paying poll.