The Brooks Review: On Caps Lock
I also applaud Google for purging the caps lock key from with Chrome OS machines. I disabled caps lock on my Mac a long time ago and I never miss it. Apple is uncharacteristically conservative with their keyboards. Consider what they've done with mice, and the low number of buttons on all iOS devices.
I heard that caps lock was a hang over from type writers. Due to the mechanical operation, it was physically demanding to hold down shift for too long.