GigaOm raises some issues.
Update (11.1.2004): see WiredReach — 'decentralized architecture: you are always in control. Your data (contacts, relationships, etc.) is never stored on a central server or web site. It always resides on your desktop where it rightfully belongs - after all, it is your network. We find that people are more willing to trust and use a service where they control full access to their private data.' NB: WiredReach is still in beta and not yet available for immediate download.