Nice and clean faucet! And I think that 15 Satoshi every hour is decent reward.
But how you're planning to monetize faucet? Now I see only some affiliate banners and no ads. You should add some ads to survive. What I can suggest - maybe add optional shortlinks for users who want bigger rewards. And maybe add alternative captcha option that users would be able to choose their prefered captcha.
Thanks for your comments and very useful suggestions - I'll take a look at those. At the moment it's just a trial faucet which I'm hoping will bring a bit of traffic to the blog.
It's a type of 'earn and learn' offering to encourage people to take a look around the site. It's not really designed to turn a profit (yet!).
What ads would you recommend? And shortlinks? Any advice would be appreciated!