- a very navigable site,
- frequent surveys,
- a fair points-award system (longer surveys give you more points, etc)
- accurate pre-survey estimates on how long each one will take to complete
- sweepstakes entries or instant-win gameplays as a "consolation prize"when you don't qualify for a survey
- an option to instantly redeem your credit for Amazon giftcodes at any point past 500 points ($5). They'll also send you a check if you prefer that.
So yeah, check them out! You might just find that you've hit a goldmine with Opinion Outpost, cowboy hat and all. ;P (confused? haha check out the site and then you can come back and hit me for making dumb wannabe-puns)
A tip before you start signing up for surveys... definitely create yourself a new email account specifically for that purpose. Its just easier to keep them all in one place and stay organized that way, and avoid cluttering up your main inbox.
Disclosure: These are referral links. If you have a survey site you like, feel free to send me your referral link in return and I'll check it out!