Writing for Thomas the Search Engine. Alternatively, think of this as a Good Housekeeping guide for keeping web-spiders happy.
Visualising the Search Engine Optimisation by seeing what your page will look like to a search engine.
Keyword research is a form of market segmentation for blogging, and micro-level segmentation for content targeting.
Advice on a the how and why of building comprehensive content around a single keyword / single cluster of keywords