Congratulations! This is a great idea. If I needed port a network and/or performance critical Linux app to the web, Arc offers some unique advantages. However there is some serious competition from Java apps, jslinux, Emscripten w/ asm.js, and (P)NaCl.

I don't have a Mac, so I haven't tried out your demo yet, but ideally you should make this work like genymotion, using the existing VirualBox install in headless mode. This would also make a much quicker install option for existing vbox users. Hopefully you can avoid the mistake YouWave made of interfering with an existing vbox installs.