The Mozilla Foundation's Persona[3] looks to be further along in terms of code and in terms of other people using it[4], differences with OpenID are partially described here[5]. Regardless of quality I think someone flying solo is going to have a hard time getting ahead of Persona at this point.
[1] http://hueniverse.com/2012/07/oauth-2-0-and-the-road-to-hell...
[2] http://hueniverse.com/2012/07/on-leaving-oauth/
[3] http://identity.mozilla.com/post/32395255498/announcing-the-...
[4] http://identity.mozilla.com/post/31008721633/application-and...
[5] http://identity.mozilla.com/post/7669886219/how-browserid-di...
edit: sigh, I put my mouth before my brain sometimes. I guess I accidentally criticized someone working in the open rather than an announcement of an undocumented web protocol.