Be a White Hat SEO for Your Intranet: It's Good for Accessibility
http://netjmc.typepad.com/globally_local/2006/05/be_a_white_hat_.html

NetStrategy-JMC
2006

Abstract:

The SEOs with white hats conduct legitimate optimising of web pages to make the site come up appropriately in the Search Engine Results Pages (also called SERPs). The back hat SEOs implement tricks to appear high in the results pages even if the web site is not necessarily relevant. The range of tricks is astonishing. But most of the techniques used by white hat SEOs were similar if not identical to the guidelines given by accessibility experts.