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5. Google acknowledges that there may be link "spikes", and so an influx of new links will be interpreted as legitimate if some of links are from "authoritative" sites. Go after links from authoritative sites.
6. If a stale webpage continues to receive new incoming links, it will be considered fresh. Keep adding links pointing to important pages.
7. Links from fresh pages will in some cases be more valuable than links from "stale" or old pages that have not been recently updated. Get links from pages that are active. If you have high value links from important sites, develop a strategy for keeping those links fresh.
8. Google places more value on a site where link growth remains constant and slow. Slow and steady wins race. Keep getting those links.
9. Pages with many inbound links will require proportionately more new links in order to remain fresh. The assumption is that more links a page has, more it should be getting in future. Otherwise it starts slipping into "stale" category. Focus more attention on your most important pages.
Regardless of whether of not Google implements all of these criteria, general direction is clear. More importantly, these points make good SEO sense, and provide a very good place to start when planning a link strategy.
Rick Hendershot publishes the Linknet Network, a group of more than 35 websites and blogs offering advertising and link opportunities to web owners.