Letters to a future age

...on the Georgia Guidestones, an American Stonehenge: Monumental Instructions for the Post-Apocalypse (Wired).

It's kind of amazing how relatively easy it is to send Rosetta Stones forward into the future, although I wonder how this monument would hold up over 10,000 years. That is a truly mind-boggling distance of time, and yet but a pittance if our species is to continue to survive in geological time.

EDIT
The third directive is "unite humanity with a living new language".