7th
Search Engine: Blekko.com
Blekko is a new-ish search engine that allows you to qualify or limit your searches using slash tags (/tag). Essentially what it does is limit your keyword search to qualified website lists that are crowdsourced by Blekko. You can also create your own qualified lists to share globally or keep private.
As an example the /humor tag only searches for your terms across 122 known “funny” websites.
Here’s a search that they did in the video: “Cats /Humor”
There have been so many times that I only want to search on sites that I KNOW will give me the content I want. Previously I have always used the “site:http://techcrunch.com blekko” function with Google, but you can only search one qualified site at a time. This is a much better alternative.