Freebitco.in, if not the most popular faucet, then it is at least among the most popular.
You can claim once every hour.
Besides the usual claims, they also offer other entertainment on the side, most recently they have started with betting.
You can also earn interest on what you have left in your account, this requires you have a minimum of 30,000 satoshi.
User Review( vote)
There is nothing bad to say about Freebitco.in, it is all in all a really good faucet that you really should not cheat yourself for.