I'm just one data point... But, while I think I grok what you're doing, I'm not sure I grok why I should want it. When I read articles, maybe 1 out of 10 makes me want to explore further. When I do want to explore further, there's usually a pretty natural way to do it-- the google search box in my browser. Google uses the link graph to find stuff related to the keyword. You're proposing to have users do it, right? The Google path doesn't seem to be broken to me... Other than the rare time that I can't think up the right search phrase to get good results.