SEO for Firefox provides a ton of usefult data on your competitors when you perform a search in either Google or Yahoo!. Here’s an example of the data points provided for “Web Design – Wikipedia” when performing a search on Google using the keyword “web design.” You can dig even deeper into the data by [...]

Compete.com lets you compare up to three Web sites and provides comparison data on the top search terms, top referral sites, top destination sites, and the number of unique visitors each site received in the previous month.
Compete.com
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Alexa shows traffic related trends for competing Web sites through mulitple data points such as your competitors’ traffic rank, global reach, average pageviews, bounce rate, site visitor demographics, etc. Alexa allows you to manually enter your site’s information and request that Alexa crawl your site as well.
Alexa.com
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