I think the cooler part of keybase.io is that it provides a platform for authenticating your separate social accounts (reddit,twitter, etc...) along with websites and github. That's pretty neat, and I can't say I've seen something like it before.

Keybase makes it really easy to sign commits. By using keybase you get to manage keys and sign quickly. gpg will take hours of reading with its non-intuative cli. You're making less work for yourself.

Gpg is the flossing of encryption. It has great efficacy and terrible efficiency.