Users of PGP will be aware of the many keyservers around the web. Keybase.io has launched as an interesting alternative to the 'boring' and complicated keyservers. They provide an easy CLI client and web client (if you choose to share your private key - I didn't) for PGP crypto, where you don't need to know someone's key id - just their username on Twitter or GitHub.
One of the main problems I see with most crypto tools, like PGP, is usability. Without innovations I don't think it will ever reach the masses. I'll be paying attention to keybase and see how it develops.
My keybase.io account id is thomwiggers.