SET-BC is a Provincial Resource Program designed to assist school districts in British Columbia in meeting the assistive technology needs of students with physical disabilities and visual impairments. There are lots of free downloadable tutorials and curriculum materials associated with AT programs such as Kurzweil, Clicker5, Boardmaker, and others at this site.
Math and Science Simulations from the University of Colorado. Can change various parameters to create simulation; can also create different graphs associated with the simulation. Appropriate for middle school and high school.
Bookshare - Accessible Books for Individuals with Print Disabilities is finally available in Canada. There is a fee for this service ($75 US for the first year and $50 afterwards) and you must fill out a form to declare the user as having a visual impairment, physical impairment or learning disability.