I have been making this argument for a while now. I think that all sites live on a progression to becoming an online community. This is why I prefer Joomla for blogging. I wrote last year about why you want to use Joomla instead of wordpress, and it stills rings true. Joomla is *much* more extensible and making that leap from blog to community is much much easier.
What do you think, should all sites move towards becoming an online community?