And here are a few other posts about youtube-dl or YouTube on my blog:

pafy - Python API for YouTube:

https://jugad2.blogspot.com/2014/06/pafy-python-api-for-yout...

youtube-dl, Python video download tool, on front page of Hacker News (2014):

https://jugad2.blogspot.com/2014/11/youtube-dl-python-video-...

How to download PyCon US 2013 videos for offline viewing using youtube-dl:

https://jugad2.blogspot.com/2013/04/how-to-download-pycon-us...