It seems DHH is hopping on the OpenID bandwagon, and that the next 37signals app will allow openid-based authentication. He’s talking about releasing his code as a plugin, so maybe I won’t need to find the time.
For those following the OpenID buzz, Simon Willison’s cool things you can build with OpenID is well worth reading to begin to get a sense of the new opportunities opened up once we have unique IDs for users that map between sites. And the comments on this post at Tim Bray’s site may help people with some lingering questions.
Update: DHH has committed the code as a plugin, and Dan Webb has posted another tutorial that’s well worth a look