http://www.memrise.com/course/682611...tory-sumerian/

The course is structured in a simple and easy way that anyone can learn. The focus of the course is vocabulary and grammar, not cuneiform. Cuneiform takes years to master, so someone just planning on dabbling in Sumerian wouldn't want to or need to learn the cuneiform signs. If you're an aspiring Assyriologist/Sumerologist like me, then you'll already be ready to read tablets once you do learn the signs!