Opera released a new test build on 18th July 2008, which will be enabling these features, 3D, Video and File Access.
Currently a user can permit the widgets used in opera to access files in his system, which will allow developers to create more and more useful widgets.
The video feature provides support for the royalty-free Ogg Theora video format
You can read the articles here
Opera announces specification for File I/O access in widgets
A call for video on the web - Opera <video> release on Labs
Taking the canvas to another dimension
All together now: Video, 3D, File access
WARNING: These are development snapshots: they contain the latest changes, but they also have severe known issues, including crashes and data loss situations. In fact, they may not work at all.
Now read and download