Each exercise on Phonétique is interactive; after giving you a chance to listen to including clearly-pronounced French words, the site engages you in an activity that requires you to prove your understanding of French pronunciation.
Take this screenshot of one of the activities, for example. In this activity, under the Alphabet heading, you are given five words that are clearly spelled in French. Each word is spelled out when you click on the symbol of the ear to the left of the blank space. Then, you spell the word in the blank. (Vowels with accents are nicely provided to the right, so you don't have to figure out how to make French accent marks on your keyboard.) Once you have answered the questions to the best of your ability, you can check your answers to see how you did. These exercises are great for testing your understanding of French pronunciation.
This second screenshot is a sample of one of the teaching files (as opposed to the exercises). These parts of the site are interactive as well, allowing you to scroll over parts of the screen and click to hear various vowel, consonant, and semi-vowel sounds as they are pronounced in native-spoken French.
Phonétique is a great site to help you perfect and evaluate your understanding and production of excellent French pronunciation.
Each exercise uses Flash player, so make sure you have that installed before trying to utilize this site.