A home brewing enthusiast had a problem with one of their fridges in a seldom-visited room, and after some trial and error has created a detailed and useful networked temperature monitor. It's based around a Freetronics EtherMega, a lot of DS18B20 temperature sensors and a TFT colour touch screen. Using this setup you can display up to twelve temperatures at once - a great use of the 1-wire interface and an Arduino. And the results are quite professional, for example:
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