MeeGo Harmattan is the Linux-based OS that runs on the Nokia N9 and N950: http://en.wikipedia.org/wiki/Nokia_N9 It's more popular in Europe than America. And I know I'm probably dreaming, as most developers skip it in favor of porting to larger platforms, but it seems Mono does have framework bindings for Meego (source: http://en.wikipedia.org/wiki/Mono_(software)#Framework_archi...)