Here's some links you might enjoy. Most link to sites related to visual impairment but I threw in anything I liked
braille bug -- neat site from AFB that lets sighted children input print and see the braille word or visa versa. There are also pages for the students do to riddles and other games in braille.
APH Hall of Fame -- an inspiring site that helps us know the people who were influential in the history of professions in visual impairment.
Toys for Children with Visual Impairments -- a great site from The Association for Retinopathy of Prematurity and Related Diseases. Wonderful suggestions for toys that have sound and texture for children with visual impairments