Synchronized Multimedia Integration Language (SMIL)

XML goes to the Cinema

Markup for movies SMIL doesn't define new graphics, video, or audio formats. Instead, it defines a framework for combining information in a variety of formats with hypertext and a time-based approach.
Multimedia presentations SMIL makes it possible to combine different pieces for serial presentation, while retaining interactivity. The markup foundations keep it largely open, though there are issues surrounding many of the formats connected.
Not really here yet SMIL's had rough going. RealNetworks uses SMIL in RealPlayer, Internet Explorer provides some SMIL functionality though its HTML+TIME support, and there are a variety of viewers available, including X-Smiles. Macromedia appears to have also declined to support SMIL.
Stuck in kiosks There are some very nice SMIL presentations out there, but SMIL has not found its way to the general Web.