Google is at the innovation wheel again. This time their mission is to make it impossible to IM in the buff.
Video and voice will be part of the new Gmail live chat video program. It requires a plug in for your browser, and apparently is easy to install. The new video chat is being slowly rolled out, but the roll out is scheduled to be completed within a week.
To see if you are enabled, start a chat, and instructions will appear in the lower left of the chat box.