Use a Terminal command to see which programs on your machine are already compiled for 64-bit CPUs.

With the OpenJDK project for Mac OS X, Apple will contribute most of the key components, tools and technology required for a Java SE 7 implementation on Mac OS X, including a 32-bit and 64-bit ...

Java SE 6 update 11 is out, 64-bit support still lacking Two months after Java 6 update 10 was released, Sun has just released update 11.