Turn on delete-selection-mode

I don't actually use this much, but I prefer it to the default behavior.
Add note to extract jedi-force.el to a package
Add writeroom-mode from MELPA

It looks superior to my hacked up focus-mode.el.
Remove focus-mode.el in favor of writeroom-mode
Add ac-ispell from MELPA
Use ispell dictionary ac-source in text-mode

I may not actually use this much, but in theory typing less is better.