Now is the time on sprockets when we dance:
Sweet tutorial by photographer Cameron Stephen. You can see his work at his blog, The Plastic Lens, and here on Flickr.
Related: 35mm Sprocket Holes group on Flickr
Another sweet tutorial video from Luke Healey, this one on loading Hasselblad A12 film backs.
(Don’t laugh if you’ve never tried to load one of these things, it’s nearly impossible to figure out on your own if you don’t have a user manual!)
Links mentioned in the video
Redscale film technique: what happens when you load film backwards
Film data index, includes notch codes