Java JDK versions on Mac OS Lion

I was just looking at the JDK on my Mac with Mac OS X 10.7.3 and it looks like I have different versions of the JDK around.
That's what I have
/Library/Java/JavaVirtualMachines/1.6.0_29-b11-402.jdk
/Library/Java/JavaVirtualMachines/1.6.0_31-b04-411.jdk
/System/Library/java/JavaVirtualMachines/1.6.0.jdk.
Why is that messed up ?
I checked to what I'm pointing and I get that
/usr/bin/java points at /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
/System/Library/Frameworks/JavaVM.framework/Versions/Current points at /System/Library/Frameworks/JavaVM.framework/Versions/A
Is that ok ? How can I check that I'm really using the most recent version of JDK, in this case /1.6.0_31-b04-411.jdk ? Should I remove redundant JDKs, and if yes what and how ?
Thanks.

Hey guys,
Sorry in advance if my question is a bit uncalled for in this thread.
Somehow I have not managed to get the latest version of Java (1.6.0_31) installed on my MacBook.
According to JavaTester.org I have version 1.6.0_29 which is confirmed by my Java Preferences Panel.
The only 2 versions listed in the panel are 1.6.0_29 (64-bit) and 1.6.0_29 (32-bit)
The webplugin check from firefox states that 'Java Applet Plug-in" is not up to date.
Firefox Add-on Tab says I have 'Java Applet Plug-in' version 14.0.3
Oracle.com says the latest version of Java is Version 7 Update 3
Java.com says the latest version of Java is Version 6 Update 31
Furthermore Java.com says updates will be automatically download through 'Apple Software Update' but it shows no sign of an update.
What's wrong? What is the latest version of both Java JDK and Applet? How can I fix this?
{- Mac OS X 10.7.3 Lion
{- Firefox 10.0.2

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Hey guys,
Sorry in advance if my question is a bit uncalled for in this thread.
Somehow I have not managed to get the latest version of Java (1.6.0_31) installed on my MacBook.
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> According to Oracle:
>
> "Java SE 6 End of Public Updates
> After February 2013, Oracle will no longer post updates of Java SE 6 to
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> the most recent Java SE versions. "
>
>
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>
> There are security concerns with having out-of-date Java versions on
> systems.
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