I read this book several years ago, in large part due to the fact that I had married a French woman and was having quite a bit of difficulty understanding the culture during my visits to France. Granted, this book largely focuses on the business aspects of the cultural divide, but I found it incredibly accurate as it relates to the culture as a whole. Especially useful was the description of a "polychronic" culture as opposed to a "monochronic" one like the U.S.
If you want to get to the root of the differences and gain an ability to work with others of France, Germany, or Japan, I highly recommend this book.