http://www.yougov.com UPDATE 1/6/2008

Been doing some research, They seem to be a good company. Wont spam your box and so on. I think they have a limit for payout though. But from what most say, it comes fairy quickly.
Best thing is they have one for america and overseas. So everyone gets a chance.

Ok, after a bit of research They have a payout limit of $50.00 Meaning you must make 50 bucks before you can draw upon your money.
They have surveys and online content that can be voted on.
From my findings it appears it can take a couple years to make 50 bucks from them. A few people state it has taken 4 years to get $50.00

They do pass your email name around to spammers.
It states clearly in their Terms of Service that by signing up with them they have the right to pass your email around to 3rd party people that have nothing to do with surveys.

It appears their surveys pay from 80 cents to 2 dollars each. You might get lucky and get 6 surveys in 1 week and nothing again for months.

They do have legit surveys and mainly are a poll taking company. They generate alot of the stats you will find in articles around the UK.
SO I would say try it. BUT with a gmail account all by itself.
Post your success here if you have luck!