I have completed another course on the Esperanto educational website, lernu!

http://en.lernu.net/index.php

“Bildoj kaj Demandoj” covers most of the basics of Esperanto grammar using the “direct method”. At the end of each of the fifty short lessons there is a very brief explanation in English of the gramatical point that was covered in the lesson. Apart from that, the course is taught entirely in Esperanto. The language soaks directly into your brain, so that you find that you are thinking in Esperanto. This is an easy course for beginners, using a very limited vocabulary, and is the one you should take first.