MCTB is the abbreviation for the title of a book called Mastering the Core Teachings of the Buddha, an Unusually Hardcore Dharma Book by Daniel Ingram.

It serves as a conceptual and terminological foundation and reference for a significant portion of the discussions on the DhO, and so reading it can be of value to understand what people are writing about and debating.

It is published by http://www.aeonbooks.co.uk/product.php?PID=27526 and can be ordered from your local independent bookseller or the standard mega-sites such as http://www.amazon.com/Mastering-Core-Teachings-Buddha-Unusually/dp/1904658407/ref=sr_1_1?ie=UTF8&s=books&qid=1242212556&sr=8-1.

A free version is also available on-line at http://www.interactivebuddha.com/mctb.shtml.