My constant reading's brought some SEO and SMO resources to light recently. First, is an excellent piece by Tyler Banfield (of Digital Point) about how to set up one way links across a network of sites. Second, I've found a series of posts on Social Media Optimization, or SMO, which you'll recall I heard about exactly one week ago today.
Tyler's derived a very simple mathematical formula to find out exactly how many one-way links you can generate across a network of websites. One-way links are those links that aren't reciprocal; their appeal is that search engines weight them more highly than reciprocal links.
The long and short of it is that
"the first half of the sites link to exactly half the amount of sites, while the last half links to exactly half the amount of sites minus one."
The other great resource (or resources, rather) is a series of blog posts on Social Media Optimization, or SMO. SMO means (re-)designing a site to be more linkable and social media friendly, with the goal of obtaining attention from social media websites.
Social media comprises those websites that involve a high degree of networking, relationships, and interaction. For example, Digg is a social media website where users can vote and comment on cool news items (often from those fellow social media websites that are blogs); the most popular items get front-page attention.
My point is that SMO is a nice complement to SEO. Making a site more attractive to what Rand Fishkin terms the "linkerati" (i.e. social media users) is a good technique to improve rankings. Linking is a social activity after all.