Useful links
http://classroom-aid.com/educational-resources/mathematics
http://www.mathpickle.com/Videos.html
http://mgleeson.edublogs.org/category/ipad/ipads-inmathematics
References and further reading
Anthony, G. & Walshaw, M. (2007). Effective Pedagogy in Mathematics/Pāngarau: Best Evidence Synthesis Iteration [BES]. Wellington: Ministry of Education.