I recently found out about a service called Website Grader. You give it a URL and it analyzes that website for SEO statistics - the stats for my blog are here.
The On-Page SEO statistics include Metadata, Heading Summary, Image Summary, Interior Page Analysis and Readability Level.
The Off-Page SEO statistics include Domain Info, Google PageRank, Google Indexed Pages, Last Google Crawl Date, Traffic Rank, Inbound Links, DMOZ Directory, Yahoo! Directory and ZoomInfo.
It also has Blogosphere statistics (Blog Analysis, Blog Ranking and Recent Blog Articles), Converting Qualified Visitors to Leads (RSS Feed and Conversion Form) and Competitive Intelligence (Keyword Grader, Score Summary and Historical Data Available).
This much is free, but there are more features available like comparing historical data if you sign up for the paid service. It doesn't say anywhere on their website how much it costs, which usually means it's expensive.
Website Grader summarizes all of this information into a Website Grade - a single number that represents how well you're doing. You can then get a widget to put on your website that displays your grade. My blog got a Grade of 85% - not bad.
My website report highlighted some interesting facts - I'm in the top 0.63% on Technorati and the top 4.68% on Alexa.

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