Patent info (excellent, free, Nolo Press)
http://www.nolo.com/legal-encyclopedia/patent-law
Trademark info (excellent, free, Nolo Press)
http://www.nolo.com/legal-encyclopedia/trademark-law
U.S. Patent and Trademark Office (official site with free patent and trademark downloads)
https://www.uspto.gov
Education and Guidance for Inventors (a classic, courtesy of OCTS, a consultancy)
http://octs.com/invntsvc.htm
Patent Search Engine (compliments of FreePatentsOnline)
http://www.freepatentsonline.com/
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