Lets you farm out authentication, so users can use their existing accounts on other services (Google, Yahoo!, Facebook, OpenID, etc.) to log in to your site.

Add social features to a website, no programming required - eg. sign in to a site with your Facebook id, find your Facebook friends who use the non-Facebook site. (Are there any OpenID-powered social networky sites that could plug into this?)

Distributed social networking project. Kind of hard to tell what they're up to/what they've done so far.

Slick, simplified version of OpenID.

Information Cards made easy.

"Appalachian is a Firefox add-on that adds the ability to manage and use several OpenIDs to ease the login parts of your browsing experience."

A PHP script that lets you host your own OpenID identity. Doesn't look too fiddly to set up, either.

Improved version.

Free for 90 days, this service gives you a .name domain with email, and tools to manage OpenID. Nice idea.

Wowsers.

An interesting piece on OpenID's potential to bridge the gaps between social networking sites.

OpenID-powered site for establishing reputations, 'claiming' concepts and making social connections, with serious and frivolous uses.

OpenID news aggregated.

A couple of good moves by MyOpenID - doesn't fix the phishing problem completely, but a definite step in the right direction.

Interesting idea, with, fittingly, good comments.

OpenID-powered password storage.

"...the way it’s currently deployed, described, and demonstrated, OpenID makes users even more susceptible to phishing than they are without it."

A really excellent introduction to using OpenID.

Excellent post on using OpenID.