This step is for testing purposes only. Go to Daily Bitcoins (www.dailybitcoins.org). Near the middle of the page, paste your bitcoin address that you copied earlier. Uncheck the “Delay payment to minimize transaction fees” check box. It is to trick people. Enter the captcha (they are very simple ones on this website), and click Send. It will tell you that it was successful. If it didn’t, reenter the captcha properly.
Wait ten minutes and then open up the Bitcoin Wallet software again. Go to the “Transactions” tab up at the top. In the list, it should have a single transaction of 0.00001 bitcoins (approx…This value goes up and down). You now have gained a small amount of bitcoins. The general conversion of bitcoins to USD is times 10, meaning that one bitcoins is ten US dollars (easy for mental math; this number varies greatly over time). Congrats! You just made one tenth of a cent!
This is a valid way to gain money. However, you can only get coins sent once every hour, so it is very slow. You won’t make any money fast with this method.
Source : http://www.instructables.com/