This is the guide that is already being used internally at Google in order to optimize their own sites such as Youtube, Orkut etc.
Having read through the guide it has to be said that this is a simple, easy-to-follow, basic 101 type of guide that any SEO newbie should read.
It has been very well written and contains a lot of illustrated examples & screen shots
What Google Webmaster Central says:
Webmasters often ask us at conferences or in the Webmaster Help Group, “What are some simple ways that I can improve my …
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