World War I: Trenches on the Web
A massive site devoted to the military history of the Great War, definitely worth checking out.
The Great War Society
Dedicated to preserving the history and deepening our understanding of the war; includes a section on genealogy with tips on uncovering information about an ancestor who fought in the war and links to battle field tours.
World War I Living History Project
This brilliant radio documentary about the twelve American Great War veterans still alive in 2006 includes interviews with Tony Pierro and Samuel Goldberg.
World War I on Wikipedia
For general information, Wikipedia is a good place to start.
The National World War I Museum
The web home of the nation’s primary museum devoted to the First World War.
O’Ryan’s Roughnecks
A lively and information-packed site devoted to the 107th Infantry Regiment.
The Archive of War Diaries
A collection of soldiers’ diaries from modern wars, including 91 from the First World War.
NY Times Article on Battlefields and Cemeteries
I wrote this piece after visiting the places in France where the 12 guys in my book fought and died.