One thing I would love to see—and which I can only assume exists—is a guide like this, tailored to writing prose rather than code. This article maintains certain assumptions that are held by nearly every other guide, like 'You are always in normal mode, and only enter insert mode for short bursts of typing text, after which you press <Esc> to go to normal mode.' Which is true and useful for coding, but slightly less so for prose—not entirely less so, and it's still a good idea to get in the habit of busting out of insert mode when you've finished whatever thought you're writing down, but the lines between thinking, composing and editing are blurrier than in prose.

Nevertheless vi controls can be pretty semantic, and lend themselves pretty effectively to working with words, clauses, sentences, and paragraphs. On the other hand, using search for mid-paragraph navigation is an order of magnitude less efficient in prose, when you're so much more likely to have symbols and words doing totally different things in many places in your text.