I find a lot of SEO advice at seo-experiments.net76.net. What I will say having read everything and tried to make sense of it is that there are two factors in google ranking.
Factor 1 = Relevance.
How relevant to the target keyword or keyphrase is the content on the site? The URL, title, headers should all contain the key to improve relevance. Within the body of text on the site, keywords and phrases should be there multiple times, but spaced out, and some instances of the phrase or word should be given prominence by being made bold or starting a paragraph with it.
The other method of improving relevance is to use the target keyword or phrase as anchor text in some links. Using it in all, may make it seem unnatural and google might not like it. But certainly having some inlinks with the key as the anchor is important.
Factor 2 = Authority.
Now domain age is a part of authority, an older domain has more authority of the bat than a new one - up to a point. If you look at page rankings vs domain ages, you tend to find older domains eventually start to slip. I believe at 10 years the authority starts to drop.
Page quality is part of this too, broken links and missing images I believe lower authority. Good code and layout - however that is interpret I think is a factor.
PageRank is a part of authority too, you tend to find if similarly relevant sites are competing, the one with a higher page rank will win. Page Rank is more or less a measure of authority, you get Page Rank from links to your page from external links, reciprocal linking doesn't work so well for getting PR, you really want good 1 way links from sites with authority, which don't have links to many other places from them. Domain page rank is not as important as the actual page with the link on it.
One of the big difficulties in SEO is being able to find places where you can put links on high PR pages which won't be removed and are not 'nofollow'. 'No follow' links are good, but they don't carry the weight of 'do follow' links and the difference is exponential. I would prefer a PR5 'dofollow' than a PR9 'nofollow', however I think I would rather a PR9 'nofollow' than an unranked 'dofollow'.
How much weight PR adds I'm not sure, if I had to guess I would say a PR1 link is worth 25, PR0 links and a PR2 link is worh 25 PR1 links.
Now here is a chart that shows what this means:-
Now I might be wrong it might only be a 5 - 1 ratio of authority. This reduces the usefulness of link farming and the reciprocal linking on link exchange pages. So would you prefer 1000 links from PR1 directory pages or 1 PR4 link? Well, if it's 25 to one the PR4 wins, but if it's 5 to 1 the thousand PR1 is worth more. I think actually it's the 25 to one, but I think the more links there are on a page, the more watered down the PR is.
Articles are a good source of links, but I'll go more into that later.
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