Here is a checklist of the factors that affect your rankings with Google, Bing, Yahoo! and the other search engines. The list contains positive, negative and neutral factors because all of them exist. Most of the factors in the checklist apply mainly to Google and partially to Bing, Yahoo! and all the other search engines of lesser importance.
If you need more information on particular sections of the checklist, you may want to read our SEO tutorial, which gives more detailed explanations of Keywords, Links, Metatags, Visual Extras, etc.
By Webfonts.com