United States Patent and Trademark Office (USPTO)
The USPTO is the federal agency for granting United States patents and federal trademark registration. Check out a broadcast-style video series called Trademark Information Network (TMIN) for explainations on the federal trademark application process from start to finish as well as critical application filing tips.
World Intellectual Property Organization (WIPO)
The WIPO is the United Nations specialized agency that seeks to develop a balanced and accessible International Intellectual Property system. The center tasks of WIPO include advancing international intellectual property (IP) standards and laws, providing global IP protection services, promoting the use of IP for economic development, and offering a forum for debate.