Abstract: A collaborative annotation system for facilitating annotations, such as commentaries, of time-based media, such as video, by users is disclosed. The system involves displaying and controlling the display of a time-based medium, and receiving and storing input for defining a location in the time-based medium. The system also involves receiving and storing an annotation relating to the context of the location, and performing and storing a valuation relating to the annotation.

Abstract: As system for navigating primary media and meta-data on a computer system is described. The system involves accessing primary media from a primary media source, and accessing meta-data from a meta-data source. The system also involves generating a graphical user interface (GUI) for providing interaction between a user and the system in relation to the primary media. The GUI includes means for facilitating control of the primary media currently being played, and means for displaying a multidimensional graphical representation for depicting a timeline for indicating the current location of the primary media being played relative to a reference location in the primary media, and providing information relating to the meta-data associated with the primary media at the current location.