The BigBlueButton team has been working on creating an HTML5 interface for BigBlueButton.

The first phase of the project is to create an HTML5 client that supports two-way chat, and one-way presentation, user list, audio and video.  We definitely want to support iOS devices with an HTML5 client and yesterday we got the first working integration of streaming audio and video for the HTML5 client displaying on an iPad

BigBlueButton HTML5 Prototype Running on an iPad – BigBluebutton.