Concerning on-page SEO best practices, I usually link out to other quality relevant pages on other websites where possible and where a human would find it valuable.

I don’t link out to other sites from the homepage. I want the Pagerank of the home page to be shared only with my internal pages. I don’t like out to other sites from my category pages either, for the same reason.

I link to other relevant sites (a deep link where possible) from individual pages and I do it often, usually. I don’t worry about link equity or PR leak because I control it on a page-to-page level.

This works for me, it allows me to share the link equity I have with other sites while ensuring it is not at the expense of pages on my domain. It may even help get me into a ‘neighbourhood’ of relevant sites, especially when some of those start linking back to my site.

Linking out to other sites, especially using a blog, also helps tell others that might be interested in your content that your page is ‘here’. Try it.

I don’t abuse anchor text, but I will be considerate, and usually try and link out to a site using keywords these bloggers / site owners would appreciate.

The recently leaked Quality Raters Guidelines document clearly tells web reviewers to identify how USEFUL or helpful your SUPPLEMENTARY NAVIGATION options are – whether you link to other internal pages or pages on other sites.