Assassination Vacation, by Sarah Vowell. Simon & Schuster, 2005

This irreverent and sassy catalog of facts and stories about presidential asassinations will illustrate more than you ever thought you wanted to know about the presidents, their assassins, the places they lived, and the people they knew. The author's research has turned up some truly surprising and eerie connections between seemingly unrelated people and events. And it's only a little gruesome!