A month a so a go I wrote this item about java 6 on the mac. It was a beta release an I had some issues with it, but it was workable. Now the real deal is ready to be installed. You can download it form the following url.
Running the update gives you two extra options in the java preferences pane. Now you can choose for java 6 (64 bit) but you can also choose for java 5 (64 bit).
I changed my settings to java 6 in the preference pane and now a java -version results in this:
java version "1.6.0_05" Java(TM) SE Runtime Environment (build 1.6.0_05-b13-120) Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_05-b13-52, mixed mode)
You still have to do the trick with the softlink, beware of the order of arguments. In my previous article I made an error. So the correct thing to do would be:
sudo rm CurrentJDK sudo ln -s 1.6 CurrentJDK
Now you are al set to start using java 6 on the mac. Have fun.