Search engine optimization (SEO) Question:
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What is the ROI [return on investment] for SEO activities? Can you give any examples? Another related question might be "How do you build a business case for doing SEO?"

Answer:

This is akin to asking what is the ROI for usability. Speed is a key component of usability. Small improvements in speed can take critical pages below typical attention thresholds, and dramatically lower bail-out rates and abandoned shopping carts. I talk about this in the book, but compression alone can save 30-50% in size and bandwidth costs. Webmasters who have employed compression and optimization typically save 30 to 50% off their bandwidth costs, and retain more customers, and have improved conversion rates.

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Have new web technologies like XHTML, CSS, Flash, and XML changed the SEO game or the ways search engines work?Have you seen UIEs research on users perceptions of download speed? Does not that really debunk the notion that code/graphic optimization improves usability? Is not it really all about scent of information and users "feeling" like they are consistently making progress?