This is my own site that I've made for my students. It contains links to good resources (videos, flash lessons, etc.) that they can use to supplement their in-class learning and the homework I give them. The resources are all student-friendly and grouped according to the IB units.
This is an excellent graphic, I showed it to my AP Macro students. They can't exactly explain it yet, but it certainly had a powerful impact. Will use it again later in the year for sure.