Bringing the Treasure Chamber to the Commons. Lively cultural commons do not replace the expertise of professional cultural intermediaries, such as libraries and archives. They rather depend on them, as a source of trusted knowledge, as a standard for verification, and as a supplier of cultural and knowledge goods. The cultural professionals themselves however face a crucial change in the understanding of their own task: they change from custodians and gatekeepers of culture into enablers and facilitators of a new culture of massive public participation in the creation, interpretation and circulation of culture. This places them right at the heart of an emerging 21st century networked culture and experience economy.