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BTW, my existing inbound links contribute insignificant traffic. Regrettably, I view their worth only as a potential source of pagerank.
Even a link from a page with PR1 contributes in raising your PR, even if it is only by a small fraction.
All pages are used in PR computation, but Google doesn't report the pages having PR<4 in the link: search.
The mileage could vary as I've seen PR3 pages reported in a link: search, but it's more like an exception.
Dan
Yes the algorithm considers them. And their anchor text.
Heres a sample of many threads we often see.
I searched for widgets and this site was #1. I couldn't find widgets anywhere on the page. I checked the cache, which matched the page. Google says the terms were only found in links pointing at the page. I checked the backlinks and couldn't find the terms anywhere. Whats up?
Thats the magic of the pr 3 link:)
... alltheweb rather scuppers that now?
AllTheWeb can only show the links found by their bots. The number of pages indexed by ATW is smaller than the number of pages indexed by Google. So Google might have some links not displayed by ATW, but it is also possible that ATW knows of a few links on pages unknown to Google.
Finally it is even possible that a link has already been found, but not yet processed. As you might know, the way to detect the Google update is by checking the backward links for Yahoo (well at least that used to be the way, but update Dominic is different story). The link-database is rebuilt roughly once a month with the Google update in order to recalculate the PageRank for all the pages.
A site that has a PR4 is a somewhat popular site and you could be optimistic and assume it is on its way up. Folks will find it, link to it and increase its page rank.
I guess thinking that way is sort of like a pyramid scheme. If you get a link from them, all the links they get from other people benefit you!