Cataloging/Indexing of Embedded Multimedia in E-Journals

I am in the process of revising a Web-based essay on the future of scholarly information access and note the potential and use of Embedded Multimedia (EM) by some e-journals. Among some of the standard media found within some e-journals are: audio and video (streaming and otherwise), VRML (Virtual Reality Markup Language), animations, interactive displays, 'live math', interactive graphs, interactive GIS, etc.

Among the journals currently utilizing EM are: