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A Browser based (with js, no plugins) screen sharing. Something like VNC for the web, for real time tech support.

Yes - and second that with a usable white board interface - Livemeeting sucks so badly!

i second the whiteboard. this could probably be done based on the VNC source.

security settings from the browsers prevent it. how, technologically speaking, does your browser have access to the whole screen's framebuffer?

You have to use java or flash or some kind of plugin which can access the windowserver.