I know of two ways :
1.If you are from the U.S this is a good way to make money. This site lets you receive cash for Survey offers. You sign up and get paid for giving for filling out surveys and pays around $5 to $10 per survey.The site is http://money.videowhack.com
2.Open to all ,This is a lot of fun actually if you like music,You can get paid to review music,3pence per track and you have to listen to a track for a minute.As you improve and if you write meaningful reviews you'll get 5p,7p,9p,12p per track etc.
You'll easily increase your pay leaving meaningful reviews.The site is http://slicethepie.com .Also read the forums for more info.Pays in pounds(sterling) to paypal.
Both sites are free to join,just give it a shot and see what happens.