GENERAL BIOGRAPHIES:
Biography.com  25,000 database of the most famous.  Good links to other sites.
Biographical Dictionary  Short dictionary style entries for more than 28,000 men and women from the ancient past to
     the present day.  
Famous People of the 20th Century  From About.com
Information Please Almanac  30,000 + entries from an encyclopedia, dictionary, or almanac
AllRefer.com  Extensive info from trusted sources on over 100,000 articles.  Divided into topics such as earth & environment, history, literature & arts, health & medicine etc.  Each section includes biographies.  Annoying pop ups
Who's Alive and Who's Dead  Birth and death date if dead, Status - alive/dead, if dead, age at death.
Who's Who online from Marquis  In library use only

SUBJECT SPECIFIC BIOGRAPHIES:
African Americans
Arab Americans  Reference Library of Arab America, 4 v.  REF 305.8927 (PLUC - In library use only)
Hispanic Americans
Historical & Political
Jewish Americans Reference Library of Jewish America, 2 v. REF 305.8924 REF (PLUC - In library use only)
Literature & the Arts

Medical
     Who Named It? Biographies of people that have diseases named after them

Native Americans
Reference Library of Native North America, 4 v REF 305.897 REF
Who Was Who in Native American History REF 970.004 WAL
Pennsylvanians
     Biographies of Pennsylvania Governors Pa Historical and Museum Commission
     Biographies of famous and not so famous Pennsylvanians Pa Historical and Museum Commission
     Famous Coal Crackers - Famous sons and daughters of the Coal Region
     Famous People From netshare.com
     Hall of Fame Divided into categories - business, science etc. 

Religion
Saints
Scientists, Inventors, Mathematicians
Sports
Women