I signed up for this site a week or so ago... they give you 100 mBTC (.1 BTC) for FREE! That's pretty generous! After that, you complete offers and surveys through Supersonic Ads to earn more mBTC and build up your total until you hit 1 full Bitcoin, at which point payout can occur. Go check them out... http://www.btc4free.com?join=10009 .