It is a nice chart but I suggest caution accompanied by a strong dose of interpretation when using this kind of data because ranking algos are being constantly updated with more and factors being added to the general equation.
Another issue is that we do not know the real value of PR as the toolbar value is merely indicative of what the actual PR score is.
What this kind of chart is good for is to understand just how difficult it is go reach higher values of PR and then again PR isn't the only (or the most important) parameter that must be considered when seeking links from other websites.
Many are mislead by that tiny strip of green and frown upon pages that have lieele if no "green real estate" (=PageRank). Don't make that mistake. A page that has no PR today can become popular tomorrow ...
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