Here are some links that might be of interest:

Board of Equalization of California

-- BOE - Listing of County Assessors

-- BOE - Property Taxes Department

-- California Property Tax(PDF)
    an Overview State Board of Equalization Pamphlet #29

Ca. Tax Collectors Assoc

California Cadastral Mapping Association

League of California Cities

California State Association of Counties (CSAC)

INDEX TO CALIFORNIA PROPERTY TAX LAW(PDF)
A comprehensive and practical index to virtually all California Property Tax related laws

CALIFORNIA LAWS, CODES & STATUTES
Search engine that provides access to the text of all California laws, codes, statutes and Constitutional provisions.

OFFICIAL CALFORNIA LEGISLATIVE HOMEPAGE
Provides access to the California State legislature, individual legislators as well as proposed and chaptered legislation . Property Tax Payment

IRS W-9 Instructions
For Affiliates/Conferences/Workshops/Seminars

IRS W-9 Form
For Affiliates/Conferences/Workshops/Seminars