Typing
I've been interested in typing quickly since I was like 12 :p
I got up to ~160wpm on dvorak before being sucked into the world of steno theory development :p
For the past year or so, I've been working on steno theories, and now a chorded keyboard layout called Pinchord :)
Hopefully I'll be using it full time soon enough (Pinchord Progress, if I ever update it lol)
There's also Orthotyping, Delusional, and Chorded Home Row :p