I make 1-2k/month from WindowTabs (windowtabs.com), I've been neglecting it, I think I could make a good bit more if I put some time into it. It's hard to say no to the consulting work...
I apply this approach and it has been a huge help, especially since I have been moving from Windows to Linux and there are many useful commands to stash away.
About six months ago I moved from Free Mind to workflowy.com and never looked back (incidentally, I believe workflowy is a ycombinator company).
I really enjoyed this post. I like the idea of rotating through the different responsibilities during the week (Product / Video & Teaching etc). I could see this helping make sure you don't neglect areas that maybe you are a little less passionate about - for example, maybe you like thinking about product development but not HR / Culture, having a split schedule like this makes sure you put a little time into the HR problems each week instead of waiting for some emergency to force you to concentrate on that.
Does anyone know what languages are used to build the software brains for the car? I haven't found any information on the actual software architecture, more on the hardware.