Most of these you just enter your bitcoin address and a captcha and you get free bitcoins. To save on fees the save your payment to a service like microwallet then one you reach a certain amount they deposit the sum to your bitcoin wallet. Honestly it's not a lot of money but if you want to get some satoshi (smallest bitcoin denomination) in your wallet and don't want to spend any money this is the way to go. Unless you have a nice GPU in your PC then you could always try your hand at mining. If you have any questions I'd love to try and help just let me know, and thanks for stopping by.
Also if your feeling generous you can always send some satoshi my way by sending them to my address here: 14DJMKjZ741sz22M6FcFD73MXdA6D2WZ3P
http://www.cryptoplanet.co/ 200 satoshi
http://dailyfreebits.com/?id=680370 100 - 1200 Satoshi every 3 hours
http://freesatoshi.ga/?faucet.php?ref=10625 100 satoshis every 6 hours