Note: An excellent collection of books and transcribed talks by Ajaan Chah is available from » Abhayagiri Monastery.

Bodhinyana: A Collection of Dhamma Talks, by Ajaan Chah, translated from the Thai by the Sangha of Bung Wai Forest Monastery (1982; 203k/68pp.)
Nine talks on meditation practice — some delivered to lay followers, some to monks.
Food for the Heart, by Ajaan Chah, translated from the Thai by the Sangha of Wat Pah Nanachat (1992; 287k/95pp.)
These ten talks were given to bhikkhus at Ajaan Chah's monastery in Thailand and contain a wealth of insight and humor into all aspects of Dhamma practice. Much of this material is probably more accessible to long-term students, rather than to newcomers to meditation.
Living Dhamma, by Ajaan Chah, translated from the Thai by the Sangha of Wat Pah Nanachat (1992; 225k/75pp.)
Nine talks by Ajaan Chah. Highlights: "Our Real Home" (also published separately as a BPS "Bodhi Leaf" booklet) and "Tuccho Pothila (Venerable Empty-Scripture)," a humorous and penetrating reminder that the real practice of Dhamma lies within.
Our Real Home, by Ajaan Chah, translated from the Thai by the Sangha of Wat Pah Nanachat (1987; 30k/10pp.)
A stirring talk given to a lay disciple approaching her death.
A Taste of Freedom, by Ajaan Chah, translated from the Thai by the Sangha of Bung Wai Forest Monastery (1991; 149k/49pp.)
A collection of ten talks delivered by Ajaan Chah in Thailand and England. These talks, given in Ajaan Chah's uniquely humorous and incisive conversational tone, span a range of Dhamma topics, from the cultivation of a balanced mind in meditation practice, to the overcoming of habitual ways of perceiving the world that obstruct the arising of liberating insight.
The Teachings of Ajahn Chah: A Collection of Ajahn Chah's Translated Dhamma Talks [PDF file] [PDF file]
by Ajaan Chah, translated from the Thai by the Sangha, Wat Nong Pah Pong (2007; 2.9Mb/731pp.)
A comprehensive anthology of Ajaan Chah's Dhamma talks, translated into English. The talks include all those that have been previously published in the following books: Bodhinyana (1982), A Taste of Freedom (fifth impression, 2002), Living Dhamma (1992), Food for the Heart (1992), The Path to Peace (1996), Clarity of Insight (2000), Unshakeable Peace (2003), and Everything is Teaching Us (2004).