The best thing about the SEO Report Card is that gives examples of how it can the pages can be improved.
I found it pretty easy to read and because it is from Google itself authorative.
The link is here –http://googlewebmastercentral.blogspot.com/2010/03/googles-seo-report-card.html
Google has also has a SEO Starter Guide which is well worth reading.
If you are looking for information about SEO – one of your first stops should be the Google Webmaster Central including:
The information on these pages does not always show up in the top search queries, so it is a great place to look at first.
I was looking for information of the effect of server location on local SEO ( like www.google.com.au – from Australia results).
After much searching I found the answer in the Help Forum. If your site is a com.au and hosted in the US, then the com.au will take precedence.
Here is the official Answer: hosting server IP address importance to SEO