For those who don't know, Dan Gelbart also has a wonderful series on prototyping.
[1] https://www.youtube.com/playlist?list=PLSGA1wWSdWaTXNhz_YkoP...
[1] https://www.youtube.com/playlist?list=PLSGA1wWSdWaTXNhz_YkoP...
Also noteworthy is his recently uploaded shop tour video (the contents make up for the video and audio quality).