I dont see how any search engine can apply a blanket rule like that. If I am selling a product or for that matter 250 products, my site map which links to every page on my site would then be classified as a link farm? I dont think that would classify. While I would tend to agree that its safest to just follow Google's suggestions, they are not interested in getting you the best results. SEO is all about finding what Google (or other SE's) looks at and manipulating it to benefit your site. If we are going to preach that you should do only what G suggests then I think you have to be applying that principle across the board... Just my two cents even though no one asked.
