I can assure you this does work ive made £15 in last 3 months or so.
Basically you answer short surveys based on different subjects they take between 2 mins and 10 mins to do and they credit you with 50p for each one .
Most of the surveys are for the government , although some are for different companies.
Myself and a freind have been doing them for a few months now and my mate has already recieved a cheque for £50 . Some people get more surveys than others as they base the surveys on your profile so you get things relevent to you.
Register at the link below.
http://my.yougov.com/go.aspx?id=d85a19db-ca5a-416f-beb8-bb4abfb4e067