It would, but even that would be somewhat intensive to run, cause you'd need to run if fairly regularly to get all the new data. I'm just not sure whether it would be an expensive operation to run on the blog

Yeah, I'd love to be able to do that, but it's pretty much impossible as a WP plugin, because you'd need to trawl through looking for the URL. As soon as FF implements URL searching in their API, I'll be there :)