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Another question related to this - due to the nature of the articles, many of the links' descriptive text will contain same keywords - this (or these) index page(s) do not have much contents except for anchor text and then the actual links. From the human visitor perspective this will look OK, however I am afraid that google might see this as keyword stuffing (density much higher than in normal text). Is that going to be a problem?
Sites like this need to be categorized and labelled in some intuitive way. You might want to read this thread: [webmasterworld.com...] for ideas about Information Architecture.
Research shows that our working memory can only hold around seven pieces of information at a time.
I tend to agree with the 5-10 different channels of information, not due as much with the working memory theory but related more to experience.
I think tedster's discussion is excellent.
I wonder if you could split your articles up into seven 'themed' groups (I also think less than 100 links to a page is better), and then use these separate themes as extra punch for your optimization strategy?
And apparently you do have an emphasis on a certain set of words that may be repeated over and over. Anything you can do to bring in variation and discriminate one from the other would benefit both your users and the search engine listings. You can overdo it. Just look at each page to see if the same word is repeated to frequently - especially in link text where perceived "keyword stuffing" can bring swift retribution.
If you keep your human users in mind, I think you will put enough word variation in your link text to steer clear of keyword stuffing problems.