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.
http://cur.lv/5jw7e
Coin Tube
CoinTube is a simple service where you can earn free bitcoin by watching videos and entering captcha checks.
http://cur.lv/5jw7r
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.
http://cur.lv/5jw2n
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.
http://cur.lv/5jwnk
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.
http://cur.lv/5jwmv
Earn Free Bitcoins
Like BitVisitor, Earn Free Bitcoins pays you bitcoin for visiting websites.
 http://cur.lv/5jw81
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.
http://cur.lv/5jw8e
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.
http://cur.lv/5jwma
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.
http://cur.lv/5jwoi
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.
http://cur.lv/5jwo1
Rugatu
Rugatu is a question and answer site, which awards bitcoin to the person whose answer has been chosen.
http://cur.lv/5jwor
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).
http://cur.lv/5jwp5
Half Hourly Sites
Can Has Bitcoin?
A funny looking free bitcoin site. Much like many of the other sites listed, enter your bitcoin address, solve the captcha, and get some free bitcoin.
http://cur.lv/5jwpn
BTC 4 You
Free bitcoin after passing a captcha check.
http://cur.lv/5jwpq
Faucet BTC
Another simple free bitcoin site.
http://cur.lv/5jwpw
Free Bitcoins
One of the better looking free bitcoin sites: enter your bitcoin address and pass the captcha check, and earn some bitcoin.
http://cur.lv/5jwq4
Virtual Faucet
Yet another simple free bitcoin site, similar to the above.
http://cur.lv/5jwqh
Free BTC 4 All
Fill out the captch and enter your bitcoin address to receive a small amount of free bitcoin.
http://cur.lv/5jwqm
Hourly Sites
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.
http://cur.lv/5jwrv
Bitcoins 4 Me
Enter your bitcoin address and pass a captcha check, and you'll get a small amount of bitcoin.
http://cur.lv/5jws0
CoinAd
Another simple free bitcoin site that requires passing a captcha check.
http://cur.lv/5jwsi
Daily Bitcoins
Despite the name 'Daily Bitcoins', this service gives you a small amount of bitcoin for free every hour.
http://cur.lv/5jwt4
Half Daily Sites
BitcoinAR
After passing a simple captcha check BitcoinAR will send you a small amount of free bitcoin.
http://cur.lv/5jwtj
Daily Sites
BitHits
BitHits gives you a small amount of bitcoin -- no captcha required.
http://cur.lv/5jwuy
Bitcoin Addict x
Enter your bitcoin address and solve a captcha, and you might win the daily jackpot.
http://cur.lv/5jwvy
Bitcoiner
Enter your bitcoin address and solve a captcha to get a small amount of bitcoin. The payout varies by the hour.
http://cur.lv/5jwwd
Bunny Run
This site lets you pick a bunny in a virtual race, and pays you a small amount of bitcoin depending on which place your bunny comes in.
 http://cur.lv/5jwbb
Bitcoin Tree
Like some of the sites above, Bitcoin Tree gives you a small amount of bitcoin after you pass a captcha check.
http://cur.lv/5jwws
HartCode
Vote for your favorite wallpaper and receive a small amount of free bitcoin.
http://cur.lv/5jwwz
One Time Sites
Bitcoin Faucet
This service sends you SMS messages (no more than 2 per month) advertising bitcoin related services, and, in turn, gives you free bitcoin.
http://cur.lv/5jwyx
FreeCoins
This service pays you a small amount of bitcoin for answering a captcha check.
http://cur.lv/5jwz6
LegendaryFaucet
This service pays you a small amount of bitcoin for answering a captcha check. (Almost idential to the service above.)
http://cur.lv/5jwzg
BitSprinkle
Send this bot a message on Twitter with your bitcoin address, and it'll send you some bitcoin :)
http://cur.lv/5jx00
VNBitcoin
This service sends you .0005 BTC after you've verified an email address with them. They won't use your email for anything other than verification, so don't worry about spam! This is currently one of the best free bitcoin sites out there.
http://cur.lv/5jwzv