Web Analytics actionable tips:
http://www.kaushik.net/avinash/2009/01/actionable-web-analytics-tips.html
http://www.kaushik.net/avinash/2008/09/pain-gain-web-analytics-nirvana-story.html
http://www.kaushik.net/avinash/2008/03/standard-metrics-revisited-5-conversion-roi-attribution.html
http://www.google.com/advertisers/online/search.html