I’ve added a ton of new links to the “California Links” page. There are many resources specific to individual counties and cities, and quite a few immigration records for San Francisco and San Diego. There are a good number of links to newspapers for the state.
In addition to all of the digital collections for vital records, I would recommend checking out California, Local government records at the California State Archives, for an “Inventory of County and City Records Available at the California State Archives”.
Here is an example of what you can find in that resource: Stanislaus County – Probate, 1854–1941*; Bonds, Letters, and Wills, 1911–1921*; Naturalization, 1856–1978*; Deeds, 1854–1902*; Homesteads, 1860–1904*; Birth, 1873–1905*; Marriage, 1854–1920*; Declaration of Intention, 1854–1976*. While these records are not necessarily digitized (parts are included in various databases), they are available onsite at the State Archives.
If you are doing California research you’ll want to bookmark this page!