Play Bitcoin Games
On SatoshiQuiz you can win free Bitcoin for playing a quiz game. Answer the questions correctly and get great prizes. There are various categories like science, movies and sports.Play
The gaming website TremorGames provides earning Bitcoin by playing games. While playing one of various flash games you will get Tremor Coins which can be redeemed for great gifts, Steam items and Bitcoin.Play
If you want to borrow or lend Bitcoin, take a look at this list of Bitcoin Lending Sites for additional information.
You can also earn Bitcoin with your own website or blog. There are various Bitcoin affiliate programs and networks supporting Bitcoin payments.