WikiWax is a cool tool that allows you to search for articles from Wikipedia. What makes it so unique is how it shows results before you click the search button. It will give you all the resulting phrases from a search, and more combinations.
For instance, when I type in the three letters “ipo” (minus the quotes) into the search box, it gives me many results, including IPO, ipod, and ipoh cuisine. I can click on the word and go to the resulting Wikipedia article. Try it out now.
(found via ResourceShelf)