The other piece to the death of centralized content servers that I mentioned in my last post is Trust. Centralized spaces like Amazon, eBay, etc. provide not only the space, but trust: trust in identities, trust that the transaction will work, trust that if something goes wrong there's a system in place to deal with it. Another part of trust is gathering ratings about users by other users. There is no distributed system for this, so this may be the key role that keeps centralized services around. How do you syndicate trust?