The Consortium in Latin American and Caribbean Studies at the University of North Carolina at Chapel Hill and Duke University offer Yucatec Maya learning materials for beginning through advanced levels.
Spoken Yucatec Maya, an online textbook, has been made available by the University of Chicago Library. "The textbook consists of a complex set of interrelated components, including audio files, different orthographies, word lists, sentences, and conversations in both Maya and English, as well as grammar lessons and associated drills."
The newspaper La Jornada Maya, published in Mérida, focuses on news related to the Yucatan Peninsula. You will find news in Maya under the tab entited K'iintsil.
The Foundation for the Advancement of Mesoamerican Studies (FAMSI) has various links of interest for students of the Yucatec Maya language, including the Combined Dictionary–Concordance of the Yucatecan Mayan Language.
This open test wiki in the Wikimedia Incubator may have relevant content for language-learning.