Cahal Pech is in the middle of having more excavations done, and they are chronicled on archaeological.org. They have some great information about the site there, along with some historical information, including the fact that excavations started in the 1950's, and that it might be one of the earliest settlements in Belize. There are also videos, pictures, and journals from the digs.
"Cahal Pech covers approximately 10 square miles and includes 34 large buildings, the largest of which is around 24 meters tall, and a possible sweathouse. The site was founded in the Early Middle Preclassic period and continued to thrive as a Maya city until at least the end of the Classic period, though there is ceramic evidence of a longer occupation. Recent excavations have suggested that Cahal Pech, which was most likely settled by Maya from Guatemala, is one of the earliest Maya settlements in Belize."