Parallax Press http://www.parallax.org/
Publishes books by Thich Nhat Hanh and others. From the website - "Parallax Press is a project of the Community of Mindful Living, dedicated to publishing books and tapes on socially engaged Buddhism."
Tharpa Publications http://www.tharpa.com/
Publisher of Buddhist books by Geshe Kelsang Gyatso about basic Buddhism, meditation and the Mahayana and Vajrayana paths.