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I'm personally more into people as the centers of gravity rather than topics. That's part of the reason why Hubski's tags are so elementary. I might be wrong about this approach, but I don't think it has been explored enough in the aggregation space.
In fact, I don't think most people understand just what it is I am doing here. :) That's probably my fault. But, I do have a plan. Most people see Hubski and think HN or Reddit. Take away the 'all posts' page, and what happens? Your Hubski and my Hubski could be very very different. If Hubski is big enough, they might not overlap at all.