Here are some useful links. I will add to this list as I find more.

Regret the Error
Journalism resources on media law
Dow Jones Newspaper Fund - editing internships
Boston Globe summer intern program
American Society of Newspaper Editors
The Slot, a spot for copy editors
Wayne Overbeck's media law class
American Copy Editors Society
AP Style exercises
Common writing errors
Testy Copy Editors
Do you speak American?
Editing tips
Useful examples

Gannett Centennial

Here are some links on newspaper design. Cruise through these to find ideas.
NewsDesigner.com
News Page Designer
Society for News Design
Ron Reason
Design Myths
Tim Harrower
Newspaper design concepts
The Santa Monica Observer
Ed's cutesy spoof of USA Today

Video workshop on Adobe Indesign