Some useful sites to earn BTC for free:

Land of Bitcoin (Faucet + tasks)
http://cur.lv/538cf

Get Free Bitcoin (Videos)
http://cur.lv/538ci

CoinAd (Paid to click ads)
http://cur.lv/538cj

BitcoinGet (Tasks)
http://cur.lv/538fd

Also check out CEX for cloud mining:
http://cur.lv/538ch