Skeptic's Annotated Bible is an annotated Bible intended for the use of atheists and skeptics. It is maintained by Steve Wells. It also contains an annotated Koran and Book of Mormon. It's a useful resource which shows why it's not reasonable to believe the Bible.
The Skeptic's Annotated Bible republishes the King James Bible, later Bibles may be copyright. Beside each text are commentaries explaining why sections are unreasonable, unjust, cruel or otherwise unworthy. Atheism Wiki frequently links to the Skeptic's Annotated Bible.