Google's O3D plugin was released to public yesterday.
O3D is a new solution from Google for making and publishing interactive real-time 3D applications. As everything that comes from big G, it is completely web oriented and aimed to run in a web browser. Very simple: you download and install the plugin (available for all major browsers [...]

Tokyo based 3Di released yesterday 3Di OpenViewer, the first commercialized browser-based viewer for OpenSim applications.
The press release states that the main features of the software are :

View and interact with 3D virtual worlds inside of web browser
Easy integration with existing web services
Designed for ease of use; navigation requires only the mouse
Supports“Internet Explorer”

Not too much info, [...]

In response to a proposal by Mozilla, Khronos Group announced yesterday an initiative to create an open, royalty-free standard for bringing accelerated 3D graphics to the Web. A working group, chaired by Mozilla, is created and should come to first tangible results in a year. The working group will, they say, consider various approaches including [...]