While many of the tools on the other sections can be used to assist learners with specific needs, the collection of tools on this page are those that I believe may be particularly useful for those with learning dificulties
1.
Wordahead - This tool gives a short animated film to explain each word. The dictionary they have created is excellent if a little limited (apprx 600 words so far). I did find the words to be quite difficult although you can upload your own videos and this in itself may make an interesting lesson. There is also a flashcard revision tool. The widget below gives you an idea of what the site can do.