search engine optimization links

Site that allows you to get a score the relative effectiveness of your site's SEO.
Keywords: tools, seo, optimization

Google only makes pagerank data public on a quarterly basis. If you want to know what your estimated pagerank is, try this tool out.
Keywords: pagerank, tools, link popularity

Ambitious but extremely useful list from SEOMoz. Includes tons of valuable website data resources available to marketers, researchers and the curious.
Keywords: metrics, tools, rankings

Free tool that can be used to check search engines for your site's search engine ranking historically. You can also use it to track the ranking of as many keywords as you'd like.
Keywords: ranking, tools, keyword rank, site rank