Search Cube - Unique way to search for information

Wolfram Alpha - Computational knowledge engine

CiteULike- Free service for managing and discovering scholarly references

Sweet Search -  There's  several search engines by Sweet Search for different groups, including Librarians and Teachers.  Every web site in Sweet Search has been evaluated by their research experts.

BevyFind

SearchCredible

eyePlorer- Graphical Search Engine

yolink
yolink Video

WePapers- Search for documents, exam and textbook solutions

A List of Search Engines by Information Need - NoodleTools

intute - Helping you find the best websites for study and research

Quintura- Visual search engine

Molu - Organizes responses by media type

Google Custom Search for History

Wiki Fact Check- Checks facts within minutes

scirus- Scientific information

ClipBlast- World's Largest Video Search Directory

blinkx- Over 35 million hours of video

MP3Realm- Vertical search engine that focuses on the mp3 audio format.

Radio-Locator- Search for radio stations

PubGene- Biological search engine that helps the searcher to get the accurate information about genes and proteins.

McAfee Threat Center- Keep up to date on computer viruses

retrievr- Search flickr images on the basis of a rough sketch drawn by searcher.