Loads of companies on the Internet offer you rewards as payment for taking surveys. You can often exchange these for cash or simply earn yourself great products for being a member. Check out SurveySpark.com's great collection.

Toluna is a great survey site with real community spirit. You can test out products too. (We've tested toothpaste so far). There are plenty of polls to take and survey invites, so you can collect money and rewards fairly quickly.