OpenID looks very promising and maybe WordPerss can play a part in it if the work is put into it.
It’s certainly something that would benefit WPMU. A community of users could post comments on each other’s blogs and bias any moderation rules in favour of the posted data getting through.
It doesn’t address trust however, but in a blogging community that can be solved in other ways (ie. when you register, the user has to click a url in an email.)
Interesting times ahead.
Perhaps it could work in a group of bloggers sharing a trust pool. I’m sure I’ve seen some RDF papers about this on the w3 site. Still, very interesting stuff.
If we could have openID or join the Drupal crew that would be great. I don’t know php well enough to try to write it.