Site freshness only matters for certain categories/topics. For other topics you could say the older the static content the better. Some of my best ranking/money

Site freshness only matters for certain categories/topics. For other topics you could say the older the static content the better. Some of my best ranking/money making pages have not changed in 8 years and rank better every year, without doing anything. Regarding ranking algos, you did not mention the Trust Rank (there is a patent G filed some years ago). A low Trust Rank is equally bad as a low Page Rank. I don't really know much about it, but afaik it has to do with the trust that G has collected on your site, while Page Rank is based on individual pages. If you link to "bad neigborhoods" (another important term, think casino sites, v*agra, etc.) your TR will go down for example, and its hard to get it back up. If National Geographic links to one of your pages, your site's TR goes way up. And then there is the number of pages on your site. Google will only crwal a limited amount of pages from your site, depending on your Page Rank and distribution of incoming links. So try to keep the number of crawlable pages focused to the relevant pages (ie the ones you'd like to see in G's index). After some time and if you have tons of links, you will see a "deep crawl" with a bunch of Gbots hammerings you server and downloading many more pages a day than usual.