1. Enter your query

For example, if you want to know what are the most useful and easiest Twitter tools:

Click on "Add sentiment" if you need several criteria.

2. Browse the results

You instantly get the opinion of the blogosphere / twittersphere to help you find the best results:

3. Refine your query

Click on "good", "powerful", "secure", etc or type any other sentiment:

4. Change the relevance to get more or less results

RankSpeed ranks results by sentiments (good, easy, etc) and not by relevance.
So you have sometimes to adjust the relevance: