Nice article at NewScientist.com
A stone found in Mexico contains a whole set of hierochlive-like characters, belonging to the oldest script yet of the America's (about 1000BC). But ofcourse it's really hard to say what it actually means.
It seems to be especially hard to decypher languages from the America's, compared to Euroasian ones. Maybe they just produced less material, or stone was/is a less favoured material among American natives? Or maybe their scripts are more complex, this one looks quite abstract compared to Egyptian hieroglives.