Hi Joerg,
Not to contradict Roman but I have managed to push the plugin out on a
windows domain of a few hundred clients like so.
1) Download the plug-in installer from:
http://dl.google.com/earth/plugin/GoogleEarthPluginSetup.exe
2) Placed the exe on a read-only network share, i.e. \\server\netlogon
\GoogleEarthPluginSetup.exe
3) Created a Group Policy start-up script for the computer context,
the script is a simple bat file containing.
"\\server\netlogon\GoogleEarthPluginSetup.exe /silent /install"
4) Applied the group policy to an OU congaing all the machines for the
plug-in to be deployed to.
That's it, at the next power cycle the machines all had the plug-in
installed.
Obviously this was on a windows domain but I can't see why a similar
technique couldn't be used on other set-ups.
There are a few caveats to this, I would read this thread for more
info:
http://groups.google.com/group/google-earth-browser-plugin/browse_thread/thread/70264245163cf4a2/269efc46e3188f4a
Hope that helps.
Fraser.