The idea of a system enabling a multiplicity of independent individuals to create lightweight value-added "trails" through a document space was envisaged most prominently by Vannevar Bush as early as 1945 [BUSH]. ComMentor can be thought of as a tool which such "trail blazers" use to add value to contents, and which other people use to find guidance based on these human-created super-structures. The overall architecture can be seen as a platform where value-added providers can provide their services (as a third player next to content providers and end users).