There are many websites which offer you to earn free Bitcoins. With most of these sites, the concept is that you visit the site and just for looking at it you get a small amount of Bitcoins. The concept has something in common with watching good old free TV. You watch a lot of ads and inbetween you get something you actually want to see, like a film or music clips.
While this is a legitimate concept, the return on your invested time is very little. So when you earn Bitcoins from these advertising sites, the Bitcoins actually come at the cost of your time. As the saying goes 'there is no free lunch'. But see for yourself, here is a list of some of the sites that I find interesting
ads4btc :: Earn Bitcoins for watching websites or videos. You can click every advert once a day, you have to view it between 5 and 60 seconds. The reward might seem small but it can add up. You get up to 1,000 Satoshi per click. In any case this site helps you to earn you first bitcoins fast.
COINADDER :: This site has a similar concept to earn bitcoins as the one listed above. You can watch videos and websites to get your first couple of Satoshis. I haven't tested this one but generally the payouts seem smaller. However, before you start to earn bictoins more seriously by watching ads, you should not just calculate the reward per view, but also how long a video view takes you. At the end of the day you want to maximize the bitcoins you earn per hour.
vidybit :: On this site you can earn bitcoins only from watching videos. Same hints as above apply. Calculate how many bitcoins you can get per hour in order to decide which is the best option for you.
freedigitalmoney.com :: Earn Bitcoins by getting rewards fo purchases made in Bitcoin. On this site you also don't need a user account and just have to enter your Bitcoin address to earn Bitcoins.
CoinWorker :: Earn Bitcoins by completing analytical tasks. A user account is required here. I haven't tried this service but payouts seem to be a bit higher than with the aforementioned sites.
Bitfortip :: Earn Bitcoins by answering forum questions. This is a nice service because it brings people together who are interested in Bitcoin and many other topics. At the same time it allows to pay rewards in bitcoin for answering questions. This is something that would not have been possible without a currency like Bitcoin that has low transaction fees and instant transfers
Earning Bitcoins from completing tasks on websites is a viable option to actually earn some Bitcoins, but don't expect your income to be very large. I regard it as a first step to get familiar with Bitcoin in general. Also, it is interesting to see what kind of services are enabled through frictionless money transfers
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