Law
and Legal Resources 
General Websites
Avalon Project -- Texts of historic legal documents from all centuries, to present
Finding Court Opinions on the Web -- Supreme Court, all levels & types of U.S. courts, and state courts (adapted from Best & Worst Legal Sites on the Web)
FindLaw -- Extremely comprehensive searchable collection of links (includes LawCrawler as an advanced search option)
Guide to Law Online -- Extensively annotated collection of links, covering U.S. federal and state, international, and multinational law; from the Law Library of Congress
Hieros Gamos: Law and Legal Research Center -- Very rich law information site, covering U.S. federal and state, and international law, and much more
Legal Information Institute -- Another extensive categorized list of links, from Cornell University Law School
Dictionaries
Everybody's Legal Dictionary -- Created and maintained by Nolo Press
Federal (U.S.) Laws, Regulations, etc.
CFR: Code of Federal Regulations -- All executive agency regulations currently in effect
Federal Register -- Includes published and proposed regulations, notices, public laws, Executive Orders, and other Presidential Documents
GPO Access -- Government resources from all branches of the government, including Congressional Bills, Congressional Record, Federal Register, etc.
Historic Supreme Court Decisions - by Topic -- from Legal Information Institute, Cornell Law School
Supreme Court -- Official site, providing docket, calendar, and current opinions
Supreme Court -- Links and landmark cases, from FindLaw
Thomas -- Laws, bills, committee reports, and other Legislative Branch information
OYEZ -- U.S. Supreme Court Multimedia
California
California Code of Regulations -- California state regulations
California Codes -- All 29 Codes representing California law
California Courts Self-Help Center -- Organized by specific need, available in several languages
California State Constitution -- Full text, searchable
Current Bills and Legislation -- Full text of Senate & Assembly bills, resolutions, including history, votes, and analyses
California Ballot Measures Databases-- from Hastings Law School
Megan's Law -- From the Office of the Attorney General. Information on registered sex offenders.
Other (All) States
State and Local Government on the Net -- Comprehensive guide to official governmental state, local and city websites
Topical Index: State Statutes on the Internet -- Over 40 topics, with links to pertinent legislation from all states
U.S. States and Territories -- Links to departments, legal documents and guides for all U.S. states and territories