Now that I have reviewed my top five survey panels, I thought I would give a mention to a few others that I like. I apologize for the UK bias to this, but this is where I live and I can only review from my own experience:
Panelbase offer a consumer related surveys for which you are rewarded in cash. Payout is at £10 which is paid directly into your bank account. The only downside is that surveys are not that frequent (monthly on average). They are one of quickest panels to payout - you will receive your money within 7 days of requesting it.
YouGov is an international survey panel who offer surveys based on political opinions, social attitudes and views on various brands. Rewards are in the form of cash, although some are for an entry into a prize draw. Surveys are rather infrequent (monthly on average).
One Poll is UK based panel and is quite unlike any other survey panel that I have ever come across. The surveys are very short - they are always on a single page so you can see how long they are before you start. The rewards are in cash, although very small for each survey. Having said that there are new surveys daily and it only takes a couple of minutes per survey. They are generally based on a variety of social attitude type topics, so more interesting than the usual consumer related ones.