The comprehensive website Edukado provides a huge repository of Esperanto teaching materials. I stress the “teaching” aspect, rather than “learning,” because the site is designed with a practiced Esperanto speaker in mind. If you know the language well enough, and would like to have some documents and lessons to help you teach others, Edukado is the place to go. They also feature news, book reviews, and plenty of other resources. Take a look, and help spread the word!
While Edukado is appropriate for small-scale Esperanto efforts, there is at least one organization that supports high-level Esperanto endeavors. If you’re planning a large academic undertaking in Esperanto, check out the Esperantic Studies Foundation. In addition to sustaining programs of their own, the ESF also sponsors research pertaining to Esperanto. Whether or not you plan to embark on such a demanding effort, a visit to the ESF’s site is an encouraging one – it reminds us that the world still takes Esperanto seriously!
*Unrelated Note*: Ironically, my last comment on being unseated as a Google result drew enough hits to render my findings obsolete over the course of one night. Thank you, Internet, for frequently proving me wrong! I still place a large stamp of approval on Mr. Alper’s blog, however – be sure to visit it, if you have the opportunity!