I just saw this post from reddit, it’s a really great read: http://blog.printf.net/articles/2015/05/29/announcing-gittorrent-a-decentralized-github/
This article describes the process and idea of designing a decentralized github (what with the China DDOS attack and other benefits of a decentralized project like this). Toward the end of the article, Chris Ball talks about using the bitcoin blockchain (or just the technology) as a project to decentralize username registration. I thought that this was a great idea!
@dirvine, you might appreciate this one. Don’t take too long to read it though, I’m still waiting for a MaidSafe beta to play with!