Here is an up to date list of all the sites where you can earn Bitcoins for free :
BitVisitor
BitVisitor pays you bitcoin for visiting websites. BitVisitor shows you each website for 5 minutes (during which time you can check out the site), and pays you for each site you visit. Between sites, you're required to enter a captcha.
Coin Tube
CoinTube is a simple service where you can earn free bitcoin by watching videos and entering captcha checks.
Bitcoin Get
Bitcoin Get is a crowdsourced bitcoin site. What this means is that once you've created an account, you can complete a variety of tasks (perform web tasks, watch videos, etc.), and get paid in bitcoin for doing so. One of the best free bitcoin sites around.
I Want Free Bitcoins
I Want Free Bitcoins is a site that pays you bitcoin for completing various offers. These tend to include things like: playing a simple web game for a few minutes, filling out a Facebook survey, etc. There are a mix of offers the site supports, so there's quite a lot of variety.
CoinVisitor
CoinVisitor pays you bitcoin for viewing websites and solving captcha challenges. What's great about this service is that you only need to view the sites for 10 seconds at a time, so it's a quick process.
Earn Free Bitcoins
Like BitVisitor, Earn Free Bitcoins pays you bitcoin for visiting websites.
Bitcoin 4 You
This is another site viewing service, through which you visit sites for 3 minutes at a time, and receive a small amount of bitcoin for each website view.
Free BTC
Once you've created an account, Free BTC allows you to watch videos in your browser and earn bitcoin for each video watched. The site has a lot of content, which makes it easy to earn some free bitcoin.
Free Digital Money
This service allows you to complete various tasks in exchange for bitcoin. They have an enormous variety of tasks, so you have plenty of options to choose from.
Rugatu
Rugatu is a question and answer site, which awards bitcoin to the person whose answer has been chosen.
Bitcoin Services
Bitcoin Services is another free bitcoin site which allows you to complete offers (some free, some paid), answer surveys, and download software to earn bitcoin. You can also watch videos to earn bitcoin (although, they seem to have a limited quantity).
freebitco.in
This is a great site. Once you register, you're able to 'play the game' every hour, which gives you a shot to win free bitcoin. Playing the game consists of entering a captcha check, which rolls the dice, and wins you either a small (or large) amount of bitcoin. It seems as though most of the time when you roll, you win a small amount of bitcoin.
Bitcoins 4 Me
Enter your bitcoin address and pass a captcha check, and you'll get a small amount of bitcoin.
CoinAd
Another simple free bitcoin site that requires passing a captcha check.
Daily Bitcoins
Despite the name 'Daily Bitcoins', this service gives you a small amount of bitcoin for free every hour.
BitcoinAR
After passing a simple captcha check BitcoinAR will send you a small amount of free bitcoin.
