A method according to claim 8 wherein the first media document includes at least one embedded mark-up element providing an active link to a second playlist that includes a reference to the second media document and, responsive to a user activating said link, the step of updating the playlist pointer includes the sub-steps of: adding the second playlist to the hierarchy as a sub-list associated with the first media document; and updating the playlist pointer to identify said second media document referenced in the second playlist.