Patent ID: 7209928

Claim:
A system for linking together digital information objects of a digital information space comprising: an overlay created by a user, the overlay maintained separate from the digital information objects; at least one concept node within the overlay, each concept node expressing a concept, each concept described by at least one keyword; at least one information node within the overlay, each information node representing one of the digital information objects, each information node linkable to each concept node; and a user interface in communication with the overlay and the digital information space, the user interface operative to (a) accept at least one keyword from the user, (b) accept input from the user indicating a digital information object in the digital information space to be accessed, (c) display contents of the accessed digital information object, and (d) display at least one user-selectable link associated with each keyword common to both the displayed contents of the accessed digital information object and to a concept described by the keyword, the user-selectable link providing access to another digital information object in the digital information space.