@Bass: I was under the impression that Mono Tools for Visual Studio was discontinued, or something like that. It's still rated as a commercial product with a 30-day free trial, but you apparently cannot purchase it anywhere: the "buy now" link just points to the xamarin store.
And the fact that there are no announcements about VS11 support just reinforces the impression.
As for Mono on the Raspberry Pi, the information I got is still rather sketchy. There are indeed reports that Mono works on that, but apparently there's no specific support. If my impressions so far are correct, Mono on Raspberry Pi would make for a great general purpose computing environment, but it would be less than hot as a hardware development platform.
When I get around to test the Raspberry Pi, I will probably skip the middle man and go native. Just wait till I need an 800MHz processor...
Off a tangent: After finding many pointers to it, I finally got around to download DesignSpark PCB, not without some skepticism. I must admit it exceeds expectations and then some. Highly recommended.