Spacedebate.org -- a new effort to expand the debate on the weaponization of space through a collaborative wiki-like tool for structured debate on a topic -- launched recently. The project is modeled after Wikipedia, but instead of focusing on developing an encyclopedia it invites users to help edit and expand an 'argument tree' that reflects the various positions in the debate over U.S. military space policy. Users can browse the argument tree or an extensive database of resources, including links to relevant news articles, authoritative quotes, and a comprehensive bibliography of sources.