Latest Discussions in realtime

I've just installed and started using Vanilla, along with a few extensions including Latest Discussions Prime. A feature that I think would be incredibly cool would be to have the Latest Discussion list in the sidebar update on a timed, periodic basis using Ajax, so that activity could be passively monitored without manual refreshing of the whole page.
Is there an extension that does this already? If not, is anyone aware of whether or not that's being developed by anyone? Any thoughts on how difficult it would be?
Thanks
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Comments
it's different of what you requested, but maybe you can grab ideas from there