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I'm guessing Inktomi either offers to customize the algo for a partner, or they provide customizable building blocks, instead of just a straight database and index. Partners take a lot of latitude in merging in other data, as well.
All of this makes judging the effectiveness of a PositionTech purchase a bit more challenging. However, the page I mentioned above is not a paid-for-spidering page. Maybe those will be more consistent across the partners. I'm waiting on my first experiments to find that out -- and this page is one of them.