Genealogy Sites

Ancestry.com - subscription site
Family Search Internet Genealogy Service (from those guys in Utah)
National Genealogical Society
The USGenWeb Project - Producing websites for genealogical research for every county & state in the U.S.
Census Online - Census sites on the web
American Civil War Research Database - Requires membership fee
fold3 - The web's premiere collection of original military records
geni.com - Another online tree and info site

Software Sites

Reunion Home Page - Family tree genealogy software for the Mac
Gene Macintosh Genealogy Software - A terrific shareware genealogy program