PeepCode has a series called "Play by Play" (https://peepcode.com/screencasts/play-by-play) where you can see a lot of professionals solve a small problem in 1-2 hours. It goes through their thought process, design and implementation. I think I've seen Ruby, JS, Python and even C in some of those screencasts.
TekPub streams are mostly javascript. I'd like to see ruby devs at work. It struck me over the weekend as I was working on some 24 Pull Request projects. We should not only share our code, but our process as well.
Edit: RailsCasts are awesome, and episode 300 (http://railscasts.com/episodes/300-contributing-to-open-sour...) is a great example. Any others?
I run NSScreencast which covers all things iOS in bite-sized weekly videos. Check it out http://nsscreencast.com
We do all kinds of screencasts - I'm editing one about ActiveAdmin on Rails right now, and we also have many other formats (.NET, some Rails) - not all just Javascript.
That said - Destroy All Screencasts is great (https://www.destroyallsoftware.com/screencasts), and PeepCode has terrific Play by Play stuff with Gary Bernhardt which I can't recommend enough: https://peepcode.com/products/play-by-play-bernhardt.
He also has Ryan Singer and Yehuda Katz doing their thing... great stuff.