I found the following digitized item online and thought someone at this board might be interested in it:

Henry H. Chaffee diary ( 1863) : 120-page diary of Henry H. Chaffee who served with the 4th Vermont Infantry during the Civil War. The diary covers the entire year of 1863 and includes accounts of the Battles of Chancellorsville and Gettysburg.

This includes a scan of the original AND a transcription (very handy for any hard-to-read sections!)

Source: Auburn University Digital Library: Civil War Diaries Collection
http://content.lib.auburn.edu/cdm/search/collection/civil