This is my first project I put together in an effort to learn more about the Arduino platform. It's a digital thermometer that with an external connector to the DS18B20 temp sensor. The first sensor I built keeps the sensor close to give me ambient temps and I'm currently building 2 others. One with long wires that I can place just further away and one that is waterproof so I can measure liquid temps.
I'd have to say, I'm really liking the speed of prototyping that the Arduino platform offers me.