Building an ExpressionEngine 2 Site - Small Business walks you through the complete build of a small business website on EE. Learn how to implement different types of content, setup the search engine, handle 404 errors and tweak the site for best performance and more. This book has successfully taught 100's of people (including EllisLab employees) how to use ExpressionEngine!
I went through your screencast on relationships today as I am currently building a site that needs a lot of one to many relationships. I found the section on Playa very helpful as I am implementing that extension for the first time. Thanks again and keep up the great work.