OAuth 2.0 Tutorial?

FWIW, I have an example project here using django and piston with oauth2: https://bitbucket.org/justinfx/django-piston-oauth2-nonrel-example

OAuth ends up being so simple, there's really no need for a library. It boils down to using HTTPS and passing the correct POST parameters as specified in the draft: https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-10

Edit for 2012: Try Google OAuth 2 playground at https://code.google.com/oauthplayground for a practical demo. It will allow you to see working requests.

There aren't any good, generic OAuth 2 tutorials. Obviously the IETF spec, like any engineering spec, is designed to be specific and verbose rather than short and simple.

Additionally many other oAuth 2 documents are diffs of oAuth 1, which is a horrible way to try and learn something.

I find Google's own (Google-specific) oAuth 2 documents relatively good to get an understanding of how it practically works - what's sent, in what request, to whom: https://developers.google.com/oauthplayground/