Ellis Island: The American Family Immigration History Center
[Public Access] Despite many commercial advertisements, this site offers "amazingly good information from government records - almost instantaneously - for genealogists and immigration history buffs." Registration is required in order to access printable information such as passenger records.
U.S. Board on Geographic Names
[Full Text] [Public Access] Official geographic feature names with locative attributes as well as principles, policies, and procedures governing the use of domestic names, foreign names, Antarctic names, and undersea feature names.