From the homepage:
Sumerian is the first language for which we have written evidence and its literature the earliest known. The Electronic Text Corpus of Sumerian Literature (ETCSL), a project of the University of Oxford, comprises a selection of nearly 400 literary compositions recorded on sources which come from ancient Mesopotamia (modern Iraq) and date to the late third and early second millennia BCE.
The corpus contains Sumerian texts in transliteration, English prose translations and bibliographical information for each composition. The transliterations and the translations can be searched, browsed and read online using the tools of the website.
Funding for the ETCSL project came to an end in the summer of 2006 and no work is currently being done to this site or its contents.The site has a link that catalogs the texts by genre, and texts are available in transliteration and translation, both Unicode and Ascii fonts. And, yes, Gilgamesh, is included.