I’m not sure when this happened, but at some point my Apple computer started spell-checking on the fly in nearly every application. A little red underline appears under any word I misspell. You just right-click on that word, and choose the correct spelling (or teach the dictionary your word) from the pop-up menu.
It recently occurred to me that, as a result of this functionality, I rarely spell check documents the old fashioned way (by clicking Tools and then Spell Check, or whatever). It’s easy to visually scan a document for the little red lines.
These are, I think, some of the most valuable technology innovations. They subtly, slowly change your behaviour without you noticing. It’s like Slow Food for your operating system.