According to the german tech-site heise.de, the Mozilla Foundation is suing Microsoft over the use of tabbed browsing in Internet Explorer 7.
The Mozilla Foundation owns the patent 5,160,296 through one of their developers (Solomon Katz, a former Opera dev) and has begun suing Microsoft in Mountainview, California.
The Foundation wants that MS imediately ceases to distribute IE 7 and pays 1.4 Billion dollars in damages.
Heise reports that Microsoft has issued no official response, but is contemplating to ship IE 7 NT (no tabs).

Eweek is reporting that Sun will Open-Source Java under the GPLv2. The portions of Java to be released are:
JAVA SE
JAVA ME
JEE

This includes the Java Runtime Environment and the Java SDK, which should ease the integration of Java into linux-distributions.

Netbeans and Catfish will be relicensed under the CDDL and the GPLv2.