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There is an issue open in the rib tracker to add blogging support. I'm not fond of blogging, and prefer a 'notes' based approach with explicit layout. Perhaps there is a middle-ground. At minimum, providing a ChangeLog.md (or ChangeLog.xml) which translates to ChangeLog.rss would be a nice compromise. I get to lay out articles however I want, with an explicit changelog that users can subscribe to for updates.
I like this idea for several reasons, and it is something I've wanted to implement myself. It would be cool to link to the diffs on github, too.