The browser's WINDOW IS EMPTY, when I click on the "KML Reference" link.
The source code of the page is:
<html></html> SysOp, please avoid dead links in the main page!
Even typing
http://earth.google.com/kml/ doesn't help.
(When I try it without trailing slash,
http://earth.google.com/kml then a "404: URL not found" will appear, what could be ok.)