Neil - I read your post about blogchains and that concept is one I was really hoping would happen with IndieForums! I've had a hard time following topics and conversations on IndieWeb sites if the conversation gets taken to another reply-thread. You get a reply, someone replies to that reply, but you as the OP or reader don't really know that there is a thread now on that reply. But if you all reference some common aggregator, the thread can stay together.
Also - one of the things I really liked (like? They aren't all dead!) about forums versus something like Reddit or Facebook is that you can ressurect a thread from the past. One new reply and it's back at the top, so the conversation can continue and new readers can easily find it.
Cross posted to IndieForums.net