Letters (Subscribe)
Links
Letters of St. Augustin
http://www.ccel.org/ccel/schaff/npnf101.vii.html
J.G. Cunningham translation. With notes. All in one file.
Letters
http://www.newadvent.org/fathers/1102.htm
J.G. Cunningham translation. Each letter in its own file. No notes. Informative table of contents page, so you're not just guessing by number.