Pronunciation tends to be the most difficult aspect of learning French. It takes a lot of practice to pronounce French correctly, but if you want to speak well, good French pronunciation is essential. Nothing kills conversation faster than an inability to make yourself understood. These resources include detailed explanations of French sounds and some audio tools for listening/speaking practice.
1. Savoir Dire, by Diane Dansereau
A complete course on French pronunciation and phonetics, with detailed explanations of each French letter and sound, a comparison of American English and French sounds, and much more. If you want to improve your pronunciation, this is the book and CD set to use. French only.
2. D'Accord: La Prononciation du français internationale
This book, by Sylvie Carduner, compares and contrasts the sounds and phonological systems of French and American English. It systematically explains how to recognize and produce each sound, and includes plenty of practice examples. There is also a detailed explanation of French spelling. Supplementary audio is optional.3. French Phonetics, by Trudie Maria Booth
This text can be used in the classroom or for self-study. It systematically explains the French sound system and the rules of pronunciation, based both on spelling and its position with a word. Also includes an introduction to IPA, which will help students to transcribe into IPA, read transcriptions, and figure out how to pronounce new words.4. The Sounds of French: An Introduction, by Bernard Tranel
This textbook, aimed mainly at English speakers trying to improve their French pronunciation, describes typical difficulties, why they occur, and how to improve them. It also explains the production of French sounds in detail and is suitable for all levels of students.5. Bien Entendu! Introduction à la prononciation française
This book is written entirely in French by Albert Valdman, one of the leading specialists of French outside of France. It includes an introduction to basic French phonetics, dialects, and intonation, and compares French and English sounds. Suitable for advanced French speakers.6. Pronounce It Perfectly in French, by Christopher Kendris
This book and tape set emphasizes French vowel sounds, including vowel combinations and nasal vowels. It approaches via spelling rather than pronounciation. Negative: it does not use IPA (International Phonetic Alphabet) symbols.