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Do these quit unexpectedly right after launch or after some time of use?

I read on the Apple support forums that there's a JavaCocoaBundle file or some name like that that can be deleted and everything should work after. The JavaPluginCocoa.bundle file is created after the Java 4 update and supposedly is the culprit. Lemme look for that thread or a related article....

Here we go:
http://support.apple.com/kb/TS2834

My Mail and iDVD are fine, so I did not delete that file for them, but my iChat does this unexpected quit all the time. So I deleted the file, but no avail.

If your iChat works fine once you log in, but quits when you're using it (video chat, transferring files, IMing with someone), try setting it so that it opens as 32-bit instead of 64-bit (HD > Applications > highlight iChat > CMD + I > set to 32-bit). So far it's worked for me.
 
You have 10.5 (Leopard ) right?

From my experience there seems to be two java issues
One related to the user account which the KB article and one related to the whole system itself which I find happens when someone does the update with everything running...

System.log should state JavaPluginCocoa.bundle is crashing.

If it is,remove from Mac HD->Library->Internet Plug-Ins.

Then I would re-install the latest java update
http://www.apple.com/downloads/macosx/apple/application_updates/javaformacosx105update5.html
 
You have 10.5 (Leopard ) right?

From my experience there seems to be two java issues
One related to the user account which the KB article and one related to the whole system itself which I find happens when someone does the update with everything running...

System.log should state JavaPluginCocoa.bundle is crashing.

If it is,remove from Mac HD->Library->Internet Plug-Ins.

Then I would re-install the latest java update
http://www.apple.com/downloads/macosx/apple/application_updates/javaformacosx105update5.html

This is what I'm seeing for iChat/Mail ETC:

"Dyld Error Message:
Library not loaded: /System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/iLifeMediaBrowser
Referenced from: /Applications/iChat.app/Contents/MacOS/iChat
Reason: no suitable image found. Did find:
/System/Library/PrivateFrameworks/iLifeMediaBrowser.framework/Versions/A/iLifeMediaBrowser: file too short"
 
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