That's ok. I think it will be interesting to see the results. It could be an indication of how much of an effect the 1st 100 backlinks Google shows have on toolbar pagerank.
In the end there might be too many variables to learn much and by all indications Google isn't showing the most important links as those first 100, but still I think your results will be interesting and fun to discuss.
And if your tool ends up being close to accurate you'll probably get a ton of links to it.
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True dat. Google demystified - all they really do is take the world's biggest database and run it through a formula you could write in Excel to figure out your page rank. Google doesn't know what it will be because they don't have all the data that will be available at the next update.