The architecture seems simple enough within the mailing list context – links with unique identifiers are generated for the footers of each message sent through the list that link to the sender. By clicking on the link you can add comments to a central database about that sender, and over time create a ‘reputation’ based on ones contributions. I haven’t really played around with some of the blog-related tools that seem to do similar things, so I don’t know if in fact they do similar things. Do they?
Plus I just love the Albert Einstein quote they have on their site: “The secret to creativity is knowing how to hide your sources.” – SWL