Perhaps everyone is already aware of this resource, but I was not. In doing some research related to my thesis I was poking around and found what appears to me to be the entire corpus of Amarna letters, with transliterations and line drawings of all the tablets. The page is a part of the larger Open Richly Annotated Cuneiform Corpus project (ORACC), which has similar sites for over a dozen other cuneiform textual corpora. Good stuff.
April 10, 2012