My module suggestions:
NeoPixel (https://www.adafruit.com/category/168) controller module - There are some awesome projects out there built with NeoPixels and I would love to be able to control them easily with a Gadgeteer board. - Something like the Fadecandy (https://www.adafruit.com/product/1689) except with a Gadgeteer socket instead of USB.
eInk display module, even better if it is touch enabled like the current Kindles and Nooks.
- While I know C & C++, I prefer to code in C# does the Lynx come with .NET libraries or does it only come with C/C++ libraries? (I know I could do a wrapper, but I certainly would prefer to use something standard.)
I haven’t used any of my .NETMF hardware in over a year, I think it is time to get back into it.