Joseph Smith...Modern Day Prophet

The fundamental principles of our religion are the testimony of the Apostles and Prophets, concerning Jesus Christ, that He died, was buried, and rose again the third day, and ascended into heaven; and all other things which pertain to our religion are only appendages to it.
- Joseph Smith, History of the Church, 3:30

The Church of Jesus Christ of Latter-Day Saints (LDS) has opened a new website specifically about Joseph Smith. It's awesome! Check it out; it will be well worth your time!

Other sites of interest:
Basic LDS beliefs
Official LDS website