Java Tiger (Java 5) is a history now after one more release from the sun, now we have Java 6. Sun has finally announced the availability of Java Standard Edition 6‘ final release.
For the guys who are working with the rich clients, the new release has splash screen, system tray support etc.
The new Java6 profilers and debuggers can now attach to a running JVM without specifically using a debugging-capable configuration. For example, if a problem is found at run-time for a production server, a debugger can attach to it without restarting the server, a valuable feature for issues that show up after the server has been running for a long period. This is a great feature for the guys in the enterprise community.
You can read more in detail at http://java.sun.com/javase/6/