Unless you are interested in an exercise of futility, it is important to only focus on those ranking factors that you, as a webmaster, can control and influence.
What are Search Engine factors do webmasters control?
Outside of the obvious (webpage title and description) those items which the webmaster has the most control are: PageRank, TrustRank, Anchor Text, Keyword Density, Domain Age, URL, and Relevant Links.

Webmaster Tips

According to Matt Cutts, there are over 100 factors that affect search engine ranking. For those of you who don't know, Matt is a Google guy guru, he is employed by Google but writes an independent blog and shares information related to Google and search engine optimization. Unfortunately, of those 100 items that account for search engine ranking, there are only a few that webmasters can actually control.

Unless you are a interested in an exercise of futility, it is important to only focus on those ranking factors that you, as a webmaster, can control and influence.

What are Search Engine factors do webmasters control?
Outside of the obvious (webpage title and description) those items which the webmaster has the most control are: PageRank, TrustRank, Anchor Text, Keyword Density, Domain Age, URL, and Relevant Links.

Webmaster Tips