Page rank question
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An excellent read which also provides links to a great article from Matt Cutts: http://www.seomoz.org/blog/google-says-yes-you-can-still-sculpt-pagerank-no-you-cant-do-it-with-nofollow
The more specific answer to your question - I recall Matt Cutts sharing that Google reserves the rights to treat links on a page differently. At the time he was specifically referring to footer links but I have since read to where that can apply in other instances. With HTML 5 and other improvements, it is clear that a link offered in content can be separated from footer, navigation and sidebar links.
Also there is the minor matter of PR decay, along with "nofollow" and other similar effects.
EDIT: I located the Matt Cutts video link http://www.youtube.com/watch?v=D0fgh5RIHdE
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Pagerank is affected by other factors than number of on page links, from an April 2010 SEOmoz blog article, "1 of 200+ ranking signals - Google's representatives have continually repeated that PageRank is just one of 'more than two hundred' signals the engine applies to the rankings equation." Some of these signals go into Pagerank distribution itself: where the link appears on the page, spam signals, etc.
Remember though that Google's Pagerank is intentionally vague. You'll have better luck figuring your numbers with SEOmoz' scoring system.