[lincolnq]

I like the idea. I can't try it under Linux (even though it's .NET based? can it run on Mono?) So I'll just give you a few thoughts.

Security? If changes to apps are "instantly propagated to other users", what's to stop me from editing an app so that it grabs another user's personal data when they next run it? You probably want a model more like Github where anyone can fork and pull, but not push to other users.

YouOS was YC-funded and failed, right? Why did they fail and how are you going to do better?