With the help of some friends from SEOChat, I've compiled a list of 93 metrics that may play large or small roles in determining how search engines rank documents in a query. This list is by no means comprehensive, but it does offer a great deal of information about each factor, as well as a relative measure of each factor's perceived importance.

I'm open to debate on the topic and would love to be reminded of the few dozen notable metrics I've almost certainly missed. Your input is greatly appreciated.