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Just goes to show that pagerank doesn't mean much.
My understanding is that the pagerank system goes in 10, ie to be a PR1 you need 1-10 incoming links, PR2 you need 11-100, PR3 101-1000 etc.
That may be completely wrong, just something I read somewhere. On that basis his site should be a PR2, not 3, but like I say it recently went to 0.
Made no difference to the ranking or traffic whatsover.
1. The Page Rank system depends on more than just the number of backlinks. It depends on the PR of the page that is linking as well as how many links are on that page. See Google PR - PageRank FAQs [webmasterworld.com].
2. There is PR that you see on the toolbar (zero to 10) and then there is REAL PR that is calculated tpo many decimal places. you never see that - it is Google's private data. The toolbar is just a simplified display, and a rough estimate. Again, see the discussion above, as well as others you can find either through our Site Search [webmasterworld.com] or in the Hot Topics area [webmasterworld.com], which is always pinned to the top of this forum's index page.
3. There is PR0 with a white toolbar - that means between 0 and 1 somewhere. Then there is "PR0" with a gray toolbar - and that essentially means "no data". Many people are seeing pages fall to a gray toolbar but still get rankings and traffic. Google has decided See The Grey Bar PR0 Phenomenon [webmasterworld.com]
Keep in mind Google's definition of pagerank, as tedster pointed out. The TBPR, what you see in the toolbar is a) a snapshot that is only updated a few times a year, and b) an approximation of each page's "real" rank around the time the number was determined.
As others have already mentioned: a well STRUCTURED site layout, with UNIQUE and QUALITY content, that results in NATURAL (and again QUALITY) inbound links are factors that influence your ranking. These are the types of factors that G uses to calculate the position where you'll show up in the results for a particular keyword. When you create a site with content that is helpful to your visitors and that is well-organized and easy to navigate you'll end up having have a much better chance to rank at the top of search results.
If traffic is steady and you're still ranking well for your chosen keywords, you're most likely already doing some of the above.
Also, don't forget to put yourself in the shoes of someone who lands on your site: why are they visiting, will your site help them to accomplish their task? If you can say yes to that, TBPR instantly becomes meaningless...
ronburk just wrote a wonderful post that explains how to look at your own site from a visitor's perspective: Log walking your way to $$$ [webmasterworld.com]