RankSpeed is a very cool new search engine that claims to search by sentiment according to the blogosphere/twittersphere. Here is the information from the actual website:

RankSpeed is a search tool that does a sentiment analysis on the blogosphere / twittersphere to find the best websites, the most useful web apps, the most secure web services, etc…

You can search for any website category using tags and rank by any criteria: good, useful, easy, secure, etc…

For each result a statistical analysis computes the percentage of bloggers who have said it is good, easy, …

For example, a website is ranked as more useful than an other if its name is more often associated with “useful”, “helpful” or other synonyms in blog posts and tweets.

RankSpeed tracks 3 millions of websites, selects the most commented in the blogosphere / twittersphere and ranks them by your own criteria.

Pretty cool is all I can say as it appears to work pretty well and provides some interesting insights.

Check it out today for free at – RankSpeed