https://www.youtube.com/user/NextDayVideo --- Mostly Python talks at conferences, meet ups and other venues

https://www.youtube.com/user/Confreaks --- Like above, but mostly Ruby

https://www.youtube.com/user/emacsrocks --- Emacs Rocks (not updated frequently)

https://www.youtube.com/user/EEVblog --- Electronics Engineering Video blog. This is an excellent resource for electronics hobbyists. This doesn't cover programming much, unless it's micro controller firmware or FPGA programming.