22. A Web-based method for accessing development components, which include an online video clip library and an online music clip library, and enabling online production of custom-integrated media products, said method comprising: receiving over a network a plurality of video and music clips from a plurality of content provider users; storing the plurality of video and music clips provided by said plurality of content provider users in a database and media content storage devices as libraries; indexing the database and media content storage devices that store the libraries of uploaded video and music clips; providing a plurality of producer users with interactive Web formatting screens, said Web formatting screens capable of allowing said producer users to select among said uploaded video and music clips; providing said plurality of producer users with an online mixer module, said mixer module capable of editing, mixing together, and playing said selected uploaded video and music clips, to thereby create video advertisement templates each comprising a static component and at least one placeholder, wherein said mixer module is further capable of allowing advertiser users to customize said video advertisement templates by uploading a list, such that advertiser users are able to automatically self-produce a set of different customized video advertisements based on an advertisement template, in which the at least one placeholder for each customized video advertisement contains a different item from the list, wherein said mixer module is further capable of arranging said video advertisement templates and customized video advertisements as respective XML files on a server, said XML files being accessible by a plurality of users using respective browser applications, such that upon updating an XML file representing a video advertisement template or a customized video advertisement, the updated video advertisement template or customized video advertisement is made accessible to users accessing the updated XML file and encoding and formatting video advertisements in particular formats.
22. A Web-based method for accessing development components, which include an online video clip library and an online music clip library, and enabling online production of custom-integrated media products, said method comprising: receiving over a network a plurality of video and music clips from a plurality of content provider users; storing the plurality of video and music clips provided by said plurality of content provider users in a database and media content storage devices as libraries; indexing the database and media content storage devices that store the libraries of uploaded video and music clips; providing a plurality of producer users with interactive Web formatting screens, said Web formatting screens capable of allowing said producer users to select among said uploaded video and music clips; providing said plurality of producer users with an online mixer module, said mixer module capable of editing, mixing together, and playing said selected uploaded video and music clips, to thereby create video advertisement templates each comprising a static component and at least one placeholder, wherein said mixer module is further capable of allowing advertiser users to customize said video advertisement templates by uploading a list, such that advertiser users are able to automatically self-produce a set of different customized video advertisements based on an advertisement template, in which the at least one placeholder for each customized video advertisement contains a different item from the list, wherein said mixer module is further capable of arranging said video advertisement templates and customized video advertisements as respective XML files on a server, said XML files being accessible by a plurality of users using respective browser applications, such that upon updating an XML file representing a video advertisement template or a customized video advertisement, the updated video advertisement template or customized video advertisement is made accessible to users accessing the updated XML file and encoding and formatting video advertisements in particular formats. 24. The method of claim 22 further comprising accessing commercial libraries of video clips and other raw material.