Benefits upgrading to Java1.6

JavaScript integrated and included with the platform
Scripting languages framework extends support for Ruby, Python, and other languages
Complete light-weight platform for web services, right out of the box
Simplified GUI design and expanded native platform support
Full JDBC4 implementation providing improved XML support for Databases
Java DB included with the JDK, a free to use and deploy Java Database
Full support by NetBeans IDE 5.5
Sun Developer Services available to help build more robust applications
Click here for more details http://java.sun.com/javase/6/features.jsp