I’ve posted a sample Gadgeteer project in Codeshare ( http://www.tinyclr.com/codeshare/entry/477 ) for sharing sensor data via COSM (used to be Pachube) and posted a blog entry at http://zingpow.ca/blog/post/COSM-and-Gadgeteer.aspx for it.
Hopefully this helps if you were thinking about posting data to COSM which is rather easy to do.
Again might I say how much I enjoy Gadgeteer and I’m looking forward to the next release of modules from Gus and the gang (hint, hint soon please as my credit card is feeling lonely) and from all you third party hardware dudes, you all have my thanks for making Gadgeteer so much fun.
Also I’m looking forward to ordering those Mountaineer Boards as they look great.