Thoughtbot discover their RFID door-lock system has an API. A short bash at some code later, and they now have theme songs when they enter the office.

"I think there's a lesson here: doing something in hardware isn't automatically cool, particularly for kids. It's harder to make things happen, so we veteran geeks get a thrill from it. We think that because it's physical, real, and a Robot, kids will automatically be excited. But for kids who are learning, and who don't appreciate the significance of the challenge, it's just hard and unrewarding."

"Botanicalls Twitter answers the question: What's up with your plant? It offers a connection to your leafy pal via online Twitter status updates that reach you anywhere in the world." Fun physical computing project.