Badgify is an Android and Arduino hack done in a 48 hour hack-a-thon for the MIDEM Hack Day 2012 in Cannes, France. It is a hack inspired by the internet of things that allows those around you to know what you are currently listening to via a badge you can pin to your bag.
It uses Last.fm and the Echo Nest within an Android app built in Processing with Amarino to communicate over Bluetooth with a 1.8" TFT LCD screen by Adafruit controlled by an Arduino Uno.