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.
BitImg
A really neat site. BitImg lets you host images for sharing (think Reddit, Digg, etc.) and pays you from any generated Ad revenue in bitcoin. A really simple (and nice) way to generate free bitcoin by sharing your images through their site.
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.
BitBin
BitBin is a pastebin service which allows you to share snippets of text (usually programming code) publicly, and shares the site's ad revenue with you (in Bitcoin) based on the amount of views your snippets get.
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).
BTC Free Game
BTC Free Game is a neat site: you register an account, play some games, and get paid a small amount of Bitcoin. Right now you can play one game per hour.
