Guidelines to Improving Your Organic Ranking

Age of web site
Length of time domain has been registered
Age of content
Regularity with which new content is added
Age of link and reputation of linking site
Uniqueness of content
Related terms used in content (the terms the search engine associates as being related to the main content of the page)
Citations and research sources (indicating the content is of research quality)
Depth of document in site
Metrics collected from other sources, such as monitoring how frequently users hit the back button when SERPs send them to a particular page
Metrics collected from sources like the Google Toolbar, Google AdWords/Adsense programs, etc.
Rate of removal of incoming links to the site
Use of sub-domains, use of keywords in sub-domains and volume of content on sub-domains and negative scoring for such activity
Rate of document addition or change
IP of hosting service and the number/quality of other sites hosted on that IP
A common postal address on the “contact us” page
Hosting uptime
Broken outgoing links not rectified promptly
Unsafe or illegal content
Quality of HTML coding, presence of coding errors
Actual click through rates observed by the search engines for listings displayed on their SERPs