Easter Rising
1916 Rebellion Handbook
The Easter Rebellion by Max Caulfield (wish I could see the notes from all the chaps he interviewed)
War of Independence
+1 for the Michael Hopkins book mentioned by Brendan
Blood on the Banner by Padraig O Ruairc (focus on Co Clare)
War of Independence in Limerick 1912-1921 by Thomas Toomey (not brilliantly written but huge amount of information)
Civil War
The Irish Civil War by Calton Younger
I didn't enjoy the 1916 book by Clair Wills. Joe Ambrose has books out on Dan Breen and Sean Treacy; there is a lot of material used in both books which is a bit of a con job IMHO.
Your query has prompted me to update my list of Easter Rising/WoI/Civil War books on LibraryThing
http://www.libraryth...log/johnnydoyle