CarolineLudovici.com has a basic cuneiform alphabet available for rudimentary translation purposes. Omniglot.com offers a more intensive listing of cuneiform glyphs and background information in both text and video formats. .
Cuneiform is the written form of the Sumerian language, which was spoken in Sumer in southern Mesopotamia. The language dates back to approximately the 4th millennium B.C. Depending on the depth of information sought, there are plenty of websites available that cover the written cuneiform language. Paleoaliens.com includes a brief overview of the history, and has a cuneiform alphabet translator which takes any sentence or phrase entered and converts it into cuneiform glyphs.
CarolineLudovici.com not only discusses cuneiform and includes a brief listing of basic glyphs, it also includes a number of educational videos. Omniglot.com offers a more in-depth look at the Sumerian history and language. The website discusses the evolution of the written language and how it started on clay tablets and tokens. It also describes how many of the glyphs evolved over the course of 3,000 years. The list of glyphs is much more detailed than other sites, including not only single letters but common symbols for letter combinations as well. The site also includes links to other educational websites for further study.