These are the MOOCs I've started. Per my comments on MOOC Completion Rates I may drop out of some of these. Also, now that Coursera let you switch sessions, I tend to do this a lot if I'm falling behind (so courses could stay in this list for a long time).
Build a Modern Computer from First Principles: From Nand to Tetris (Project-Centered Course) (HUJI)
TESOL Certificate, Part 1: Teach English Now! (ASU)