David Sparks did a great job summarizing the amazing tricks of TextExpander shell script magician Brett Terpstra. I was thinking about doing the same, but I've been too busy playing with, or rather implementing, them in my workflow. Ahem. Dr. Drang also offered his own, decidedly more Darwinian take, on the matter.
I've also got an interesting-to-me TextExpander + Hazel workflow story queued up for this week, so stay tuned for that—or put on your geek-speak ear muffs if this is all too much for you.