Yesterday we updated the KML Language Reference, and moved it to a new home (although the old links will always work). You can find it at:

http://earth.google.com/kml/

Hopefully, the move will make it easier for us to refresh the document and correct mistakes and omissions, which you are hereby invited to post. (As if we could stop you ... )

Thanks (on behalf of our fearless documentation guru),

- ink

PS. 'Forementioned guru is now working on a new tutorial. Stay tuned...