Useful Links for SEO and SEM

How do the search engines relate to each other? See Bruce Clay's search engine relationship chart.
http://www.bruceclay.com/searchenginerelationshipchart.htm

How do you write content that helps your site visitors and walks them through the buying process? This course is concise, to the point, and has practical examples and exercises. Highly recommended. Karon Thackston has received repeated and well-deserved praise for:
The Step-By-Step™ Copywriting Course

Jill Whalen is a leading light for ethical search engine optimisation. She shares extremely valuable and condensed knowledge on what to do and how to do it. Again, highly recommended.
The Nitty-gritty of Writing for the Search Engines

SearchEngineWatch is probably the most authorative source on the web for everything about search engine marketing. Run by fellow Brit Danny Sullivan, it's packed with information, articles and news.
http://searchenginewatch.com/