Others have beat them to it. Here is an exhaustive list, after this short little intro:
The difficulty in cataloging, and understanding, the Jehovahs Witnesses beliefs lies in the constantly changing nature of their core doctrine over the past 140 years. A careful study of their beliefs reveals a religion in perpetual metamorphosis justified by the Society's New Light Doctrine. The fallacy with this reasoning goes to the very nature of the definition of truth, for that which is false cannot be true, and the Jehovahs Witnesses beliefs are premised on the notion that they alone possess, and have possessed, the truth.
Nonetheless, the following websites detail, and expose, many of the Jehovahs Witnesses beliefs; some commentary is mere summary, others go into great detail, some are accurate, others not. Students new to the religion are often not told about controversial beliefs, but are presented with non-controversial, benign doctrine. What is often left out of the discussion at the preliminary stages are such deeply held beliefs as a) pre-incarnate Jesus Christ, the Word, was a created angel, b) Jesus while on earth was nothing more than a man, c) only 144,000 anointed Jehovahs Witnesses go to heaven, d) the 144,000 will rule over mankind on a paradise earth, e) the Bible, particularly the New Testament Greek Scriptures, was written primarily for the 144,000 anointed, f) the New Covenant is temporary, and only between Jesus and the 144,000, g) all non-Jehovahs Witnesses regardless of their beliefs will be killed at Armageddon, h) there is no soul that survives after death (annihilism), i) there is no hell, j) all Christian faiths such as the Roman Catholic Church and Protestant denominations are the work of Satan, and much, much more. Individuals contemplating this religion as their path to salvation are strongly encouraged to conduct some research into the Jehovahs Witnesses beliefs. To that end, the websites listed below should help further your understanding of this controversial religion.
See also: Jehovahs Witnesses Beliefs - Part II and Beliefs and General Criticism .
Roots in the Occult, Freemasonry and Pyramidology
Failed Dates and False Prophecy
And if that isn't enough, jwfacts.com has a great history section, much recommended.