The Association of Research Libraries  (ARL) has an intellectual property Web page with information on current legislative activities as well as court cases and legal decisions.
An overview of intellectual property by the American Intellectual Property Law Association. 
As Andy says on his info page, this is a "one-stop information resource to inventors, attorneys, artists, writers and editors, engineers and students, and any others interested in the broad fields of patents, trademarks and copyrights."
This site has information on the ethical, legal (including intellectual property), and social issues  surrounding the Human Genome Project.
This site also has information on the ethical, legal, and social issues surrounding the Human Genome Project. 
The Web site of the U.S. Patent and Trademark Office.
IP Magazine 
This site has an excellent archive of articles on intellectual property. Visit their subject index to see a list.