Google Webmaster Guidelines
Google Webmaster Guidelines are a set of written rules and prohibitions that outline recommended and forbidden website practices. You can find these webmaster guidelines at http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=35769, though you'll find it easier to search for Google Webmaster Guidelines
and click on the top search result. You should read through the Google Webmaster Guidelines and refer to them occasionally. The guidelines are divided into design and content guidelines, technical guidelines, and quality guidelines.
Google Webmaster Guidelines in a nutshell
At their core, Google Webmaster Guidelines aim for quality in the technology underlying the websites in their index, high-quality content, and also discourage manipulation of search results through deceptive techniques. All search engines have webmaster guidelines, but if you follow Google's dictates, you will not run afoul of any of the other search engines. Here...