Metadata: Seven Tips for Writing Better Keywords
http://www.gerrymcgovern.com/nt/2004/nt_2004_03_01_keywords.htm

McGovern, Gerry
New Thinking
2004

Abstract:

The shift in how search engines treat keywords is significant. They tend to ignore the keyword metatag and rather look for keywords in the actual page content. This means that you need to figure out your keywords before you write any content. Then, you include them throughout your content, particularly in headings and summaries.