I'm cheating here a bit as well, since I work on the Zapier team, but some of my favorite use cases are ways my wife uses Zapier for her small business. Whenever an Ebay or Etsy sale comes in via PayPal, Zapier records the sale, along with fees and shipping price, in a Google Docs spreadsheet, and then copies the shipping address to a plain text document in Dropbox to easily print out address labels. It's a tiny thing that saves a ton of time.

Then, I've got Twilio integrations with Zapier that let me get Twilio SMS messages on my phone, and more, which I wrote about here: https://zapier.com/blog/how-to-twilio-international-phone-nu...