This semester I am teaching Recitation 5 of 18.03, Differential Equations. If you are curious to find out my perspective on teaching, take a look at my teaching statement. As for old course webpages, the following survived so far.
18.785 Analytic Number Theory at MIT.
Math 52 Linear Algebra at Brown University.
Math 17 Advanced Placement Calculus at Brown University.
Math 10 Calculus II at Brown University.