Sounds like this: http://www.sas.com/technologies/bi/content_delivery/intrnet/index.html
I have been eyeing it for a while, waiting for the next budget plan.
I'll be interested in seeing what others have to contribute toward answering your question. You can easily write code that can tap everything added to specific sites, if the sites allow it, but I'm not aware of any way to trap added web content in general.
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