The publication Suddha-Nama Bhajan by Sri Srimad Gour Govinda Swami is now available as a book and for online reading.
Suddha-Nama Bhajan, a must read for aspiring Vaisnavas, takes the reader through the three stages of chanting. The first chapter nama-aparadha (the offensive stage of chanting) gives a full explanation of the ten offenses. The second chapter describes Nama-abhasa (the intermediate stage of chanting), which is the first glimmer of the holy name. The last chapter, in two parts, portrays suddha-nama (the pure chanting of the holy name) the stage wherein one chants purely and sees the Supreme Lord face to face.
For more details about the book and to read it online: http://goo.gl/j6RcJZ