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Blekko SEO Analysis
Blekko is a search engine that has been around since 2007 and it uses slashtags to increase the relevancy of searches.
It also comes with some handy SEO tools built in, for example backlink profile for any URL or even domain.
Check the example links below.
DoubleClick Ad Planner
This Google tool gives wealth of invaluable information like traffic estimates and audience data.
Shared Count will give you social media activity breakdown for any domain - Tweets, Likes, Google +1, LinkedIN shares, Diggs...
Backtweets finds all tweets mentioning the given domain, great for monitoring your own or competitor's brand.
A firefox plugin, SEO Doctor (created by author of this article) helps you improve on-page SEO for any page as well as quickly access all tools mentioned in this article, as well as many other popular SEO web applications.