Part 2 of my guide on all things firmware! Covering everything in Marlin from the available gcodes over the built-in safety features to using your spare pins for something useful!
http://www.youtube.com/watch?v=In93vVd1WDQ&t=0m52s Power-user tips
http://www.youtube.com/watch?v=In93vVd1WDQ&t=3m11s Advanced options in Configuration.h
http://www.youtube.com/watch?v=In93vVd1WDQ&t=13m40s Even more advanced things in Configuration_adv.h
http://www.youtube.com/watch?v=In93vVd1WDQ&t=17m27s Bending the electronics to your will with pins.h
http://www.youtube.com/watch?v=In93vVd1WDQ&t=21m32s Using custom temperature sensors with thermistortables.h
Part 1 https://www.youtube.com/watch?v=2RbcMvhatjU&index=12&list=PLDJMid0lOOYnRCAdbFfzECor3EbqF8euw
http://www.youtube.com/watch?v=In93vVd1WDQ