YouGov pay you a proportional amount of money to do surveys that take about 5 minutes (you usually get about 50p-£1 per survey), and when you get to £50 in your account, they send you a cheque.

http://www.yougov.com/users/registrationintro_ref.asp?refid=380715&jID=3&sID=1

Sign up here and I'll get a referral bonus and I'll buy you a pint if/when I see you.

Thanks x