Stumbled across this quite nifty search and earn site. It's called search lotto. For every 25 genuine searches you do using their search engine, you get an entry into the National Lottery (as part of a 10 person strong syndicate). I believe the numbers are lucky dip. Credited searches are limited to 10 per day and 50 per week but the search results are good as they use Yahoo.
Setting up an account is free and you can do so here (this is a referral link so you may chose not to use it):