Covert Superhighway - the missing component?

Scratch Monkey proposes building an Eternity service using the Stego File System, provided an anonymous broadcast channel exists - it's assumed that alt.anonymous.messages will do the job. I suspect that wide deployment of Eternity would lead to this group being closed down. We need a more robust anonymous broadcast channel. Let's call it the `Covert Superhighway'. How do we build it? Ross