for a classroom.
Matt Parker: Stand-up Mathematician
For introducing/consolidating math theories (this one for trig ratios) - RISPS (Rich Starting Points) www.risps.co.uk
Simple smart board for your iPad
Ted talks on maths
Nrich maths problems
Daily Desmos: have a go at making these graphs
How to add an image to a QR code http://flapjackeducationalresources.blogspot.com/2012/10/how-to-add-image-to-qr-code.html