Have any of you guys explored online courses? http://www.class-central.com/ <--- indexes many sites including: https://www.coursera.org/ https://www.edx.org/ https://www.canvas.net/ http://www.udacity.com/ I am halfway through Coursera's Model Thinking and found it very interesting. The other Coursera course I started, but didn't finish had an instructor with poor presentation skills. On Udacity I'm following Steve Blank's How to Build a Startup course. I like Udacity because they don't follow a fixed schedule like Coursera does. I'd be interested to hear from other SFers taking online courses, and maybe get suggestions on interesting courses to explore.