US Patent and Trademark Office (US Dept. of Commerce):
www.uspto.gov

USPTO, specifically for small businesses:
www.stopfakes.gov/smallbusiness, OR www.uspto.gov/smallbusiness

Computer Crime and Intellectual Property Section of the Criminal Division of the US Department of Justice:
www.cybercrime.org

US Customs and Border Protection, Intellectual Property Rights:
www.customs.gov

Intellectual Property Law Server (Website started by Canadian firm):
www.intelproplaw.com

Intellectual Property Watchdog, Inc.:
www.ipwatchdog.com

Intellectual Property Owners Association:
www.ipo.org

American Intellectual Property Law Association:
www.aipla.org

World Intellectual Property Organization:
www.wipo.int

InnovaSafe, Inc. IP Escrow Services:
www.innovasafe.com

Licensing Executives Society:
www.usa-canada.les.org

Boston Stock Exchange
www.bostonstock.com

Pacific Exchange - Stock and Options
www.pacificex.com

Philadelphia Stock Exchange
www.phlx.com

Chicago Board Options Exchange
www.cboe.com

Chicago Stock Exchange
www.chx.com

International Securities Exchange
www.iseoptions.com