redz - interesting search engine that allows you to see an image of the web pages before you click on them
quinturakids - gives you related words that you can add tor take away from your search
dibdabdoo - can't remember why I like this one other than it was recommended and has a cool name
kigose - allows you to use multiple search engines at once and compare the results
boolify - shows you how to do a boolean search by dragging and dropping puzzle pieces
Enjoy.