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A&E's 100 Most Influential People of the Millenium  
Who2.com
For a quick start of your web searches of famous people including most famous scientists and researchers use this biography search engine. Just enter the name into the search box and get a brief biography together with the 4 most relevant links.
Biographies - The Scientists
With some exceptions (Newton, Copernicus, etc) this site provides short biographies of the most famous scientists.  
from Peter Laundry (blupete.com)
Biographical Sources
WWW Virtual Library for the History of Science, Technology & Medicine
Computers : History and Development  
Biographies of people who played a role in the computers history.
Distinguished Women of Past and Present
Excellent metadirectory of famous women in various fields including science. Categorized by subject or name. Created by Danuta Bois
Indexes of Biographies (Mainly mathematicians)
Listed by name or chronology. Search engine available From School of Mathematics and Statistics, University of St Andrews, Scotland. Provide also reference information, quotations, awards and related links. Excellent
Spotlight Biography : Inventors  
Original Biographies and links to other resources.
From Smithsonian.
Biography Resource
The internet's biography resource, linking to thousands of biography-related sites, including autobiographies, journals, letters, diaries, memoirs, biography collections. A must
Biographical Dictionary
This dictionary covers more than 28,000 notable men and women who have shaped our world from ancient times to the present day. The Dictionary is searchable by names, keywords, and dates.
Biography-center
The Biography center is directory of biographies available on the Web (more than 10122 biographies !). Search by name
Biography.com
Search a database of biographical information on more than 20,000 famous people and historical figures. Biographical summaries includes related persons and links 
Top Biography Resource 
350 Full Text biography on World Famous personalities

Selected Biographies

Albert Einstein
Everything you want to know about Einstein (his life, writings, quotations, pictures). Many links
from Albert Einstein online. 

Galileo Galilei  
Biography from The Institute and Museum of the History of Science of Florence, Italy

Isaak Newton
This a virtual museum of I. Newton with original material and a multitude of relevant  links. 
from newton.org.uk previously known as "Newtonia"

Leonardo da Vinci
His life and inventions from the National Museum of Science and Technology of Milan Italy 

Alexander Graham Bell