Over the past weekend I've finished my latest project: Netduino Weatherstation. You can read all about it on my blog.
I connected some different sensors that I had and made the Netduino talk to my Windows Phone. No need to step out of the house, or even out of bed to check the weather :-)
Maybe someone can comment why it works with my 5V 1A 2200 mah power bank, USB also delivers 5V so I figured it could work but brownouts could be a problem?