Document Control

I know that configuration management software such as CVS is often used with open source software projects, but this project’s end-product will be primarily online, technical documents, not software. Is there a free, online, collaborative system (something similar to Wikipedia maybe) that is better suited to this project, something that will enable technical editors and such to add markups for review? Does anyone know of a server willing to host these documents for free? What level of control should there be for these documents (e.g., anyone can add markups but only assigned maintainers can edit)?