I agree that the sites should be kept separate. I don't like the idea of all the Amiga forums becoming amalgamated. But amiga.org at least has an RSS feed. I don't know about the others. But if they all had RSS feeds, then an additional site could presumably pool the RSS information in to one feed. If this could include recent threads as well as news then it would give you all of the information you asked for.
--
moto