I just received my Netduino Plus. Netduino is an open source microcontroller development board working with the Microsoft .Net Micro Framework.
The good news it that the pins layout of the Netduino is compatible with the pinout of the Arduino, which means you can re-use your Arduino shields.
The Netduino Plus comes with a microSD slot and Ethernet support. It’s great to get these features without having to stack a shield on top of the board.
All I have done so far is blinking a LED on pin #13 … I’ll keep you posted when I get something more interesting to show.