General:

Internal Revenue Service -- Tax forms, information, rulings and reports for businesses and individuals. 

Library of Congress  -- Contains current federal legislative information, museum exhibits, research tools and access to the card catalogue systems for the Library of Congress and several of the larger public libraries around the country. 

Corporate and Securities:

Arizona Corporation Commission -- Provides sample forms in PDF (Adobe Acrobat Reader) format, fee schedules and general information for incorporation, state securities filings and the other divisions overseen by the ACC. 

California Department of Corporations -- Offers information on the divisions run by the Department of Corporations, including the Securities Regulation Division. 

California Secretary of State -- Contains forms, fees and general information regarding corporate matters and state UCC filings. 

Nevada Secretary of State -- Contains information on incorporating in Nevada, a fee schedule, and fax-on-demand instructions for obtaining forms. 

Securities and Exchange Commission -- Includes information regarding investor assistance, the SEC's rules and policies and complete access to EDGAR, the SEC's filing system. 

Small Business Administration -- Federal-level information and help for small business owners. 

US Patent and Trademark Office -- Offers information regarding patent and trademark matters, sample forms in PDF format and articles and reports published by the USPTO. 

US Copyright Office  -- Provides information regarding copyright matters, sample forms in PDF format and announcements published by the Copyright Office. 

Arizona:

State of Arizona -- The general state site for Arizona.  Lists all state agencies by governmental branch. 

Arizona Department of Revenue -- Information and forms regarding state taxes for businesses and individuals. 

Arizona Supreme Court -- Includes Supreme Court and Appeals Court opinions, news, releases and general information. 

Maricopa County Superior Court Law Library -- Offers card catalogue searches and links to state and federal legal services. 

State Bar of Arizona -- Listings of  Arizona attorneys, attorney resources and other information. 

Law Schools and Libraries:

ASU College of Law
Harvard Law School
Marshall College of Law
Stanford Law School
University of Chicago
Yale Law School