The Letter Repository contains hundreds of personal letters from the early 18th Century through the Second World War. A large portion of the letters are from periods of conflict, the largest chunk being from World War Two, though there are also sizable numbers from the First World War and the American Civil War. There are also quite a few love letters. You can both see scans of the letters (and photographs or other materials) as well as transcriptions, which you can edit should you spot errors. One of my favorite collection of correspondance is the one between a Herbert Beyer, who served in the Air Force in World War Two, his darling Cleo and his parents.
posted by Kattullus on Aug 25, 2009 - 11 comments

Soldier's Mail: Letters Home from a New England Soldier, 1916-1919.
posted by Pater Aletheias on Jul 9, 2009 - 11 comments

Saddam's farewell letter.
posted by goodnewsfortheinsane on Dec 27, 2006 - 46 comments

Past Voices serves up a collection of old letters, postcards, diaries and memoirs. Some are matter-of-fact: "While I am thus writing, I will tell you of an instance which happened 3 or 4 days ago. Two men were shot to death for desertion.", while some chronicle amazing historical events: "I heard two of the Germans shouting ' don't shoot we are bringing you some cake.' They were told to go back, but they would not, they came right up to our trenches."
posted by mr_crash_davis on Aug 27, 2003 - 10 comments