This fine volume is exactly what it sounds like: an extended discussion of the features that make Judaism unique. If you're interested in this topic and if this book ever returns to print, buy it at once -- and in the meantime, pick up a used copy.
Abba Hillel Silver (an American Reform rabbi probably best known for his staunch support of Zionism when it wasn't fashionable) takes the reader on a grand tour of Judaism's distinguishing features, comparing it not only with Christianity but also with Hinduism, Buddhism, and Taoism where these are relevant. Mainly, though, this volume is a positive portrait of what Judaism has historically stood for.
This book has served as my introduction to Judaism. Although I do wish I had a greater background in the subject so that I could draw deeper meaning from some of the text, I greatly enjoyed reading it.
A good start to the discussion, but I wanted more depth. He relies much on outside sources and commentary, rather than the Scriptures in speaking about differences.