More recently, the term has come to denote the active opposition of religious belief and religious organisations, rather than plain non-believing atheism. Antitheists generally believe that religion, whether intrinsically or by its misuse, makes the world a worse place in which to live.
Many books on the subject can be found, most of them written in the last few years (popular antitheism seems to be quite trendy nowadays). Some famous examples are Richard Dawkins' The God Delusion, Christopher Hithens' God is Not Great, Sam Harris' The End of Faith, and Ibn Warraq's Why I Am Not a Muslim.