Wikipedia is a good example. Each page uses many links with the targeted keywords to link to relate pages. This is a very good example of SEO.
IMO the "best" way to ensure you interlink relevant pages on your site properly is to use "Theme Pyramids" or topic silos. One of the best articles about it is Brett Tabke's post on "Theme Pyramids" (about 1/3rd of the way down... look for the red and blue diagram - 4th post on thread). It is old, but still VERY relevant today. I used it when we redesigned our 4000+ URL site recently and it has really increased my ability to rank pages on the site. As a side effect, almost anytime I get a page to rank, it has an indent with either the parent or child page.