There you go, it has happened — Google published its SEO guide (best practices) for webmasters. Covered on 22 pages, Google gives advices for improving visibility on Internet search engines and, of course, for increasing the number of visits.
This document should be of interest especially to webmasters interested in basics of optimization, and the document deals with following areas:
Description Meta Tag
Creating Quality Content
Heading Tags (H1s, H2s, etc.)
Google introduced this document on Pubconu a few days ago, referring to it as a document they use themselves for their site optimization.
PDF document can be found on this link, and a short post can be read on the official Google Webmaster Blog.