A very basic temperature monitoring application. You can add a list of temperature sensors, which you can build by yourself - check out this tutorial (in Polish): http://www.dobreprogramy.pl/mktos/Madrzejszy-dom-RPi-oraz-DS18B20,51666.html (part 1), http://www.dobreprogramy.pl/mktos/Madrzejszy-termometr-czesc-2,51859.html (part 2) and http://www.dobreprogramy.pl/mktos/Madrzejszy-termometr-czesc-3,52731.html (part 3) and monitor temperature of everything you want!
You can also pin temperatures to your Start screen and see them at a glance and they will be updated periodically. Perfect next generation of thermometer outside your window.