Copyright

United States Copyright Office
Copyright Litigation Blog

Trademark

United States Patent and Trademark Office, Trademarks Page
The TTABlog

Patent

United States Patent and Trademark Office, Patents Page
PatentlyO

Member and General Blogs

Florida IP (Woody Pollack)
IPKat

Intellectual Property Organizations

American Intellectual Property Law Association (AIPLA)
Section of Intellectual Property law, American Bar Association
International Trademark Association (INTA)