del.icio.us ingredients: CMS+RSS
Content Management Systems (CMSs) help create identity, community and collaboration, and Rich Site Summary (RSS) automates and fosters communication within and between these identities and communities. If CMS-based websites are like silos of knowledge on specialised issues, RSS is like the wind that blows between them, cross-polinating all the ideas, people and communities along the way. Aaaaaahh... sounds del.icio.us to me.