So it's finally OK to mention it now; Java has made it explicitly possible (read legal) to distribute the Sun Java JRE/JDK on a GNU/Linux distrubtion. The new license is for Java SE 5 on Linux only, called the Operating System Distribution License for Java, or DLJ for short. You can read the license in text or pdf form. The FAQ for the DLJ is also available in text and pdf. Heck, go through the README for the JRE and JDK while you're at it.
So what does that mean? Well, GNU/Linux distrubtions like Debian can now package a Java runtime environment or Java development kit in their repositories. That was previously not possible due to restrictions present in Java licensing. Users still have to accept the Java SE 5 binary code license that is totally not free and has the same restrictions Java has always had, but this at least makes packaging and supporting Java less painful for distributions.
Sun is coordinating the efforts via a java.net project, jdk-distros. This is an unprecedented level of cooperation from Sun with external parties in anything related to Java. I consider myself fortunate to have been a founding member of the project. It has been a pleasant and refreshing experience to meet a few optimistic and forward-thinking people from Sun who have a keen interest in Free Software; a big thanks to Simon Phipps and Tom Marble. I was encouraged that they allowed our contributions to be covered under the MIT license. If you would have told me that a month ago I would have laughed at you.
The Debian announcment should be posted on the debian-devel-announce list today. I am sure this will draw both praise and ire from the Debian community. That's cool, though; the rich diversity is part of what makes it such a vibrant organism.