Sfgenealogy.com has a new TAG production, the San Francisco 1867 Great Register.
The Register is a voter registration index that contains information on approximately 16,365 individual males,including naturalization details for many of them.
Naturalization details include date, place and court of naturalization
http://www.sfgenealogy.com/sf/1867g/sfgr67.htm
For more naturalization records online see http://naturalizationrecords.com/