Some websites offer a program where you can get a free bitcoin when performing multiple tasks like paid to surf, fill out surveys, watching videos, referral programs, etc.

BitVisitor.com - paid to surf, payment per hour.
EarnFreeBitcoins.com - paid to surf
IWantFreeBitcoins.com - finish offer such surveys etc.
Rugatu.com - get answered questions bitcoin with other members (such as yahoo answer)
CoinURL.com - earn bitcoin by placing ads on your website / blog.
Coinad.com - enter the captcha 1 hours
dailybitcoin.org - includes a once-daily captcha
bithits.info - once daily
cointicket.org - enter the captcha
BunnyRun - completed the captcha and select the fastest bunny
btcfaucet.com
bitbin.it
bitcoins4.me
abitback.com
cointube.tv - free bitcoin watch video
legendaryfaucet.herokuapp.com