Useful links
Blacker's Boys: The 9th Battalion Royal Irish Fusiliers in the First World War
Combined Irish Regiments Association
Northern Bank War Memorials/ Roll of Honour
The Public Records Office of Northern Ireland
The Commonwealth War Graves Commission
The War Graves Photographic Project
National Archives of Ireland: Censuses of Ireland, 1901 and 1911
Irish Genealogy: Birth, Death and Marriage Records
Government Records Office Northern Ireland: Birth, Death and Marriage Records
Belfast City Council Burial Records
Personnel Records of the First World War: Canada
National Archives of Australia: Defence and War Service Records
Prisoners of the First World War: International Committee of the Red Cross Archives
Friends of the Somme: Mid-Ulster Branch:
Cookstown War Dead
Dungannon War Dead
Magherafelt War Dead
Eric Pruitt, through his grandmother Annie, has pointed out this interesting page on Irish-American Immigration History.