Vim

First, a working .vimrc. My .vimrc does most or all of the keyboard mapping work necessary to make insert mode operate correctly using normal keys (arrows, home, end, backspace, et cetera) instead of freaking out.

Cheat sheets

If these pages vanish from the web, I've also seen them in the Wayback Machine, so no worries.

• Vim cheatsheet
• Another vim cheatsheet