1. A method for providing changed content identification for an online document that is accessed by a user or user agent, comprising: identifying a reference point for an online document that a user or user agent is interested in accessing, comprising a stored prior version of the document; retrieving the prior version when the user or user agent accesses the online document; comparing elements of the prior version with elements of a current version of the document; and automatically updating a presentation of the current version with visual or auditory representations that identify changes of content between the prior version and the current version.