The Educational Testing Service (ETS) and the AP College Board have a number of excellent resources at their disposal, and this site provides a cornucopia of materials about teaching and learning calculus. First up is the information about the actual AP Calculus AB course, which may be most useful to those teaching the course at the high school level. Most visitors will want to take their time looking over the "Classroom Instruction and Resources" area. Here visitors will find special focus materials on approximation and differential equations, along with sample lesson plans and curriculum modules. The modules cover extrema, motion, and reasoning from tabular data. History of mathematics-types shouldn't miss the "History of Calculus" area, as it is quite a pip.