From Supermechanical.com.

Twine is the simplest possible way to get the objects in your life texting, tweeting or emailing. Get an email when the basement floods while you're on vacation, a text when someone's knocking at the front door, or a tweet when your laundry's done. A durable 2.5" square provides WiFi connectivity, internal and external sensors, and two AAA batteries that keep it running for months. A simple web app allows to you quickly set up your Twine with human-friendly rules — no programming needed. And if you're more adventurous, you can connect your own sensors and use HTTP to have Twine send data to your own app.