I've always been in awe of folks like Xah Lee who do extensive remapping of their keyboards. I have enough problems remembering key sequences without changing the keys around on my keyboard so I don't do that. Now abo-abo has taken this to extremes with his keyboard layout.
First, he repurposes 【;】 as a modifier key to select alternative mappings for the other keys. For example, 【l】 just inserts the letter
l but 【;+l】 inserts
<. He also has special keys to insert various sorts of brackets, and to do things like jump to a bookmark or change windows. Take a look at his post to see the full setup.
This sort of thing is definitely not for me but I do think it can be very useful, especially for adding key sequences with an additional modifier key. You should definitely take a look even if you don't think it's for you. Perhaps you'll find it more useful than you think. Abo-abo says that after using his setup for a while, the plain QWERTY keyboard feels unbearably sluggish.