This set of applications lets you set up audio drop-boxes so your students can record and turn in their spoken answers. There are also ways to create worksheets for videos and embed them together in a "mash-up" activity. Especially for foreign language teachers, this seems like an awesome assortment of apps!
Learning Ally is a website that helps support students with learning disabilities. They offer many audio books that assist students reading needs. They provide support for parents, students, and educators.