ASCAP – American Society of Composers, Authors and Publishers (music related)
Christian Copyright Licensing International – For music lyric permissions
Publishing Law Forum – I highly recommend this site.
Copyright Clearance Center – Register your for work for use by others or to obtain permission
The Copyright Web Site - The best copyright resource on the internet
How to Cite Material Obtained from the Internet
Rights for the use of photographs. Corbis Images, iStockphoto.com, and Getty Images are great resources for finding the right photo, without breaking copyright laws for their use.
When Works Enter the Public Domain
Buy the book, The Copyright Handbook: How to Protect and Use Written Works 10th Edition by Stephen Fishman, Nolo Press.
Buy the book, The Copyright Permission and Libel Handbook : A Step-By-Step Guide for Writers, Editors, and Publishers(Wiley Books for Writers) by by Lloyd J. Jassin and Steve C. Schecter, John Wiley & Sons Publishing.
Contracts Watch newsletter from the the American Society of Journalists and Authors
Buy the book, Kirsch’s Handbook of Publishing Law : For Author’s, Publishers, Editors and Agents, by Jonathan Kirsch, Silman-James Press.