It'd be interesting if advogato's diary engine allowed replies to entries. Seems like it would fit into the whole theme of "community site for free software developers". Of course, a diary is different from the main articles page, so the owner of the diary should have more control over it. Perhaps the ability to delete postings, or to restrict them to a set of trusted accounts (maybe adapt the site wide trust metric to a personal trust metric by using yourself as the seed instead of the seed accounts).
Enough rambling about that. But life sucks anyway, and I don't feel like elaborating on that in public.