Hi i would like to send data from my netduino board directly to my app that is hosted on appharbor, I couldn't find any examples. I may be asking the question wrongly, if so thanks for you patience. :)
This post has resources on how to send http reqeusts from .NET Micro Framework apps. If you send JSON from the board, you can receive in an ASP.NET MVC 3 action on AppHarbor. There's an example on this question: Receive JSON from external server, parse it and save it to local database with MVC2