Collège de France (for those not familiar with it) is an important institution in France. It provides free access to lectures in french across a broad range of academic topics. The lecturers are generally very well known in their field. Some lectures are at an advanced and specialized level, but many are acessible to general listeners. The Collège de France web site often has transcript or slides to go with the lectures. If you are more than a beginner in French, give it a try.