There is a lot of research behind each Maya Hackers project, the following links are very useful:
Mayan Languages Academy
Authentic Maya. Nice summary of mayan culture
Ancient Scripts.com: The Maya writing system
Cracking The Maya Code
FAMSI Mesoamerican civilisations studies
MesoWeb Native American Culture Articles
WAYEB European Asociation of Mayanists.
Kerr Maya Vase Collection
The Temples of Palenque.
The Maya Codices
Chilam Balam of Chumayuel by F Ross.