There is an excellent resource on alternative text and text readers, we highly recommend looking at and copying called:
Accessible Textbooks in the K–12 Classroom (2010 Revision)
An Educator’s Guide to the Acquisition of Alternate Format Core Learning Materials for Pre-K–12 Students with Print Disabilities
You can access this resource at:
http://aim.cast.org/learn/aim4families/school/accessible_textbooks
