Top Sites
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.
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).
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.
Bitcoin Jackpot
Bitcoin Jackpot is a simple giveaway site -- you simply enter your Bitcoin address, complete a captcha check, and bam -- you'll get some free Bitcoin.
BTC 4 You
Free bitcoin after passing a captcha check.
Faucet BTC
Another simple free bitcoin site.
Free Bitcoins
One of the better looking free bitcoin sites: enter your bitcoin address and pass the captcha check, and earn some bitcoin.
The Free Bitcoins
Identical to the site above, but with a different colorscheme.
Virtual Faucet
Yet another simple free bitcoin site, similar to the above.
Free BTC 4 All
Fill out the captch and enter your bitcoin address to receive a small amount of free bitcoin.
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.
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.
Free BTC Net
A simple hourly Bitcoin payout site. Like some of the other sites listed here, all you need to do is fill out a simple captcha check to claim a reward.
Half Daily Sites
BitcoinAR
After passing a simple captcha check BitcoinAR will send you a small amount of free bitcoin.
Daily Sites
NetLookup
NetLookup is a simple free bitcoin site. Just enter your bitcoin address and they'll send you some free bitcoin -- no captcha required.
BitHits
BitHits gives you a small amount of bitcoin -- no captcha required.
DrawBTC
DrawBTC is one of my favorite sites -- you enter your Bitcoin wallet address, and have a chance to win a certin amount of Bitcoin every day. You're not guaranteed to win, but the odds aren't bad!
Bitcoin Addict
Enter your bitcoin address and solve a captcha, and you might win the daily jackpot.
Bitcoiner
Enter your bitcoin address and solve a captcha to get a small amount of bitcoin. The payout varies by the hour.
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.
Coin Ticket
Receive a small amount of bitcoin by entering your bitcoin address and solving a captcha.
Bitcoin Tree
Like some of the sites above, Bitcoin Tree gives you a small amount of bitcoin after you pass a captcha check.
HartCode
Vote for your favorite wallpaper and receive a small amount of free bitcoin.
Infrequent Sites
Bitcoin Dispenser
Bitcoin Dispenser is a free bitcoin lottery. Enter your bitcoin address, and every so often a random winner will be selected, and all the donated funds will be given to the winner. Although the lottery is infrequent, you can win a decent amount of bitcoin.
BitCrate
BitCrate is a small bitcoin game where you break a crate and win some bitcoin. The site is updated frequently, but they run out of bitcoin quickly, which is why it's listed under the Infrequent Sites category.
The Bitcoin Faucet
The Bitcoin Faucet is an interesting game. The way it works is that people donate bitcoin into the pot, and once the pot is full a single lucky user will get an entire bitcoin. Worth playing, since the payout is extremely high.
Bitcoin AdSmart
The way Bitcoin AdSmart works is that once every 150 users enter their bitcoin addresses, a single user is chosen at random to win some free bitcoin.
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.
FreeCoins
This service pays you a small amount of bitcoin for answering a captcha check.
LegendaryFaucet
This service pays you a small amount of bitcoin for answering a captcha check. (Almost idential to the service above.)
BitSprinkle
Send this bot a message on Twitter with your bitcoin address, and it'll send you some bitcoin :)
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.
All site is search in google/bing.