The Church of Jesus Christ of Latter-day Saints just published an article (will appear in the October 2015 Ensign) on Joseph Smith, the coming forth of the Book of Mormon, and the role of seers and seer stones: https://www.lds.org/ensign/2015/10/joseph-the-seer?lang=eng
I believe that this article is a must-read for members of the church or for those interested in Mormon history. I’m grateful for the continued work the church does into releasing copies of primary historical sources, doing so according to high historical standards for preservation and research. While none of the information in the above article is new, having current scholarship presented in a straightforward and concise manner is helpful.
Also of note in the article is a photograph of one of Joseph Smith’s seer stones (not the ones included with the gold plates), which the church has in its possession. It’s a rock and has no power beyond the power and inspiration given to the seer using it.