I'm not really eager about making comments just a JS widget... tools like Disqus are IMO quite clunky, as anyway then the comments interaction is "outside the site itself" which will not feel very natural or integrated.

What I'd do instead is make maemo.org synchronize the comments between a thread in Midgard database and the Talk database. This way users can comment and read via both interfaces.

See our current data model, it'd be easy to add a "Talk thread ID" for each item. Now we track commenting threads based on object GUID that is being commented as the comments widget in Midgard can be attached to any content type.