This page holds a collection of best practices for specific SEO tasks.
Feel free to add additional pages:
This article series explains how to configure DokuWiki for best SEO results.
SEO optimization for Wordpress is covered in this article.
A description of Joomla's SEO features and their optimal use.
As the budget of small businesses is usually not very big it is important to start optimising as early in the process as possible. SEO for small businesses covers the MUSTs in SEO.
This article describes a road map with the basic tasks to perform for every web based startup.