I earn a lot just from these 3 sites alone. You can try them too:
http://cur.lv/1yn04 – No registration. Put your address, enter the captcha then wait 5 minutes. You will visit visit a few websites and for each website you get between 1 and 10 uBTC. After you reach 100uBTC, you’ll receive the coins in your wallet.
http://cur.lv/1yn06 – Registration optional. Earn 0.00001 BTC every hour or just keep refreshing the page and you might get a better prize. You can also win vouchers for peerbet (gambling site).
http://cur.lv/1ymzg – Registration required. Watch ads for a few seconds and earn BTC. You can make about 0.00028BTC daily.