I've started writing up little mini-reviews for myself when I finish watching a movie or reading a book (or comic). I am currently saving these to a text file in nvALT but I also like the idea of saving them to Day One. I originally got the idea from Tulio Jarocki but when I finally got around to it, his site appears down under re-construction.
Anyway, the snippets all call up some fill-in fields and option fields letting me describe, rate, and review each media. Since I read quite a bit, I find these little notes helpful when recommending books to friends and to confirm whether or not I've read a book already, which, sadly, sometimes takes me 100 pages to realize.
On the subject of TextExpander, they just released version 4.1 with 100% more EMOJI.