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Originally Posted by jon
I wouldn’t base too much weight on this information. It can only be used as a very rough guide. A link on a PR 4 page for example would hold a lot less weight if there was more than 1 out-going link.
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Quite true.
I believe the PR values are scaled up in powers of roughly 10, so 10 x PR4 = 1 x PR5. However this would only apply exactly if you where the only link from that page, and therefore it gets diluted depending on the number of other links on a page.
I wouldn't concentrate on PR to much - the context of the surrounding text is much more important - especially since the last google update. I used to use link-vault.com on a site I had and had thousands on anchor text links pointing to our site. This worked great for a couple of months and then Bam, google changed its alogrithm and the site dropped like a stone. There has been a lot of specualtion on why - as this happened to thousands of sites, and the majority conclusion was that it was because the links where devalued because the links where totally out of context with the content on the page.
So the key is to get your links on a themed page - a high PR page link which is off topic will do you a lot less good in the search engines than an on topic link from a much lower PR page
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