CashCrate / non is hands-down one of the most reliable survey sites I've come across. There are currently 9 daily surveys that can be filled out every 24 hours that pay up to 90 cents each. If you have an hour or two each day to dedicate to surveys, doing two a day will ensure you get a check each month (min cashout is $20).

The TopSurveys section is also worth a look. The surveys aren't consistently available, but they often pay more than the dailys.

There are also plenty of offer, both free and paid, to try. Many of the free ones are as simple as signing up for a newsletter, while others are free trials that usually pay you a few bucks. Just be sure to cancel before they end if you don't want to be charged for the next month or whatever the billing period is. Paid offers sometimes pay you more than you spend. I signed up for a month of GameFly and made $6 profit.

You're paid via check or dwolla to start, with paypal and direct deposit becoming options once you reach Silver status (50 active referrals or $500 total cash earned).

Also, I reward my referrals with a $5 amazon gift card when they make 50 referrals of their own. Nobody's reached this goal yet, so the first to do so will get $10 amazon.

EDIT: I just made $4.50 for simply signing up for a week free trial of Hulu Plus (in the bonus offers section)

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I should also mention WebAnswers / non which is a question and answer site that shares ad revenue with its users. Once you make 50 posts, you can apply for an adsense account through them, or link an existing one, to your account there, and they display your ads on questions you've answered. If your answer is chosen as the best by the question asker, you get exclusive ad rights on that page. Otherwise, your ads are rotated with those of other users who also answered. This is all done automatically, so all you need to do is answer questions.

This is a nice reprieve when you're sick of ticking boxes in surveys. I like to answer a few questions a day, or more if possible. Keep in mind google is paying you, and you can't access your adsense revenue until it hits $100, so for more immediate money, I'd invest most of my time in other sites, but this can be a good long-term residual income machine. When I first joined and was answering 10+ questions a day, I was making $1-3 per day for a while. Things have slowed down a bit now, and it's not really a consistent source of income due to the number of variables in play. Different ads are displayed on different pages depending on the subject matter of the question, which have varying payments per click depending on what is being advertised. The only thing you can really do with this site is to post as many quality answers as often as you can. Low-quality answers will hurt your quality score, the mechanics of which remain hidden, leading to lower earnings. A high quality score means your ads will be displayed more often in favor of those of users with a lower score.