Very impressed with Yougov
Got my first £50 cheque from them today (took 4 months to earn it) and I particularly like that that they don't screen you out after 16 pages of questions to avoid paying you. If I get invited to a survey (most are 50p - £1.50), I get paid for doing it.
Any other good survey sites out there? I gave up with Pinecone and ToLuna because of the screening out thing.