This presentation: http://www.cafeaulait.org/slides/nycjava/java7/
Java 2007: The year in preview: My article on IBM DeveloperWorks
Pure Danger Tech ยป Java 7: Alex Miller is tracking various proposals
"Managing the Java classpath (Unix and Mac OS X)" (Elliotte Rusty Harold, developerWorks, December 2006): Tips for mastering this most complex and infuriating part of the Java platform.
"Crossing borders: Closures" (Bruce Tate, developerWorks, January 2007): Investigates the importance of closures in Java syntax.
"The Cathedral and the Bazaar" (Eric Raymond, 2000): Explains why open source is good for the Java platform and other products.
Planet JDK: Aggregates the blogs of many people working on the next Java release.
Early ideas about Java 7: A video presentation by Sun Microsystems's Danny Coward.
The Java Kernel Project: Ethan Nicholas explains the inspiration between the newly renamed Java Browser Edition.
The java.net scripting project: Integrating dynamically typed languages with the Java Virtual Machine.
The Java Module System (JSR-277): Explained by Specification Lead Stanley Ho.
The Swing Application Framework (JSR-296): Join the effort to define the future of Swing development.
NIO.2: An effort to finally define a decent cross-platform filesystem API.
Throw your ideas into the Kitchen Sink Project and see what sticks.