I heard about a new search engine today, made by exGoogle people, it is called cuil and my experiments with it have found it really useful. It takes images from pages too which gives it a different feel to any other engine. One of the things I found using it was the blog below from someone at the Institute of Design in Chicago which is interesting. Also discovered a video networking site where you can download the videos. The one below looked good but the sound quality was very patchy on my computer.
(This link replaces the link to "Cull" which no longer works but provides a list of topic based search engines provided by Alexandra Sawyer - October 2012)