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Although this article is already a month old, I have to applaud everyone involved at SEOmoz who created an extremely comprehensive list of Search Engine Ranking Factors. They provide you a great checklist of search engine optimzation factors to keep in mind and rank them according to what some of the more respected voices in the SEO industry deem as "important".

There isn't much "new" content here as much of what is covered should be pretty basic to the seasoned SEO, but it does provide a prioritized checklist for SEOs to follow and use to review client sites. Keywords in TITLE tags, inbound links, domain age and other factors are noted (obviously) as major factors contributing to SEO success. This SEO checklist provided me a valuable tool for performing site evaluations.