Lots of stuff, you could for instance use them for sensors, say to monitor the temperature of your house and control it from anywhere on the Internet. With som

Lots of stuff, you could for instance use them for sensors, say to monitor the temperature of your house and control it from anywhere on the Internet. With some of the faster wifi modules that can run linux on them, I could see making a system of wifi enabled speakers for a house, so you could stream the same music to many rooms. I'm planning on hopefully using something like the ESP8266 attached to a microcontroller to control/inspect my brewing hardware (so I can see what my beer is doing - admittedly rather niche ;)