Experiences with OpenID?

As regular readers will know, one of the features I like most in DrProject (and its predecessor, Trac) is the RSS feed it automatically creates showing events from each project. Unfortunately, we've had to disable the feeds for class projects at U of T, since we don't want students in one group to be able to see the check-in comments or ticket updates of another, and web-based blog reading services like Bloglines haven't standardized on an authentication mechanism. However, I've been seeing a lot of buzz about OpenID recently, which has me wondering whether it's worth rolling the dice and incorporating support for it into DrProject. Oh, and running some sort of authentication server in the department, tied into the IDs students are automatically allocated for courses. I don't want to venture into these waters without a guide --- anyone out there done this yet?
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