Throughout this chapter, several third-party tools have been mentioned or recommended for analysis, research, and testing. This section introduces a few more that are worth mentioning.
Aaron Wall of SEO Book created a useful data enhancement tool with the SEO for Firefox extension (http://tools.seobook.com/firefox/seo-for-firefox.html). When turned on, this tool provides extra data that can be populated automatically or on request from within the regular search results of Google, Yahoo!, and Bing. Some of the most popular data points this add-on provides for the URL or domain of each search result include: Google PageRank, site age, various backlink metrics, .edu and .gov link counts, bookmarking and social metrics (such as number of Digg votes), DMOZ listings, and additional reporting from other third-party tools.
UrlTrends provides a monitoring dashboard that automatically tracks basic metrics for a site and offers a comparison against the entire list of domains being monitored by UrlTrends. In addition to link popularity, Google PageRank, and Alexa Rank, UrlTrends also records outgoing links, a snapshot of keyword rankings, and social bookmarking metrics. UrlTrends offers a free account that provides basic reporting for a limited number of domains.
SpyFu is primarily geared toward PPC advertisers, but it offers valuable keyword data for SEO professionals as well. There is a free version that provides valuable but limited data, ...