Posterous is probably the easiest way to allow anyone to share a reference, resource, or any media related to the Horizon Project. Simply email the URL to a custom address -- all content shared is aggregated (and becomes searchable) at the project's site,

The most recent content submitted in this way is displayed here via an RSS feed. This provides a way for people beyond the project to contribute information to the Advisory Board. If you would like to become a posterous contributer, please contact us at for details.