This is exactly what Nokia were working on; the N9 ran Meego, a Linux-based OS Nokia had been developing for years. There had been a string of "internet tablets" (eg N800, N810) and phones (N900) running Maemo, a precursor to Meego. They even bought QT as part of the development!
Meego, running on the N9, was an absolutely wonderful experience. It was smooth, fast, beautifully designed, and had simple elegant swipe-based navigation system, it had multiprocess app switching (AFAIK before iPhone OS did) and a brilliant newsfeed/notification system. It felt like it really had extraordinary potential. And Elop ditched it.
Meego, running on the N9, was an absolutely wonderful experience. It was smooth, fast, beautifully designed, and had simple elegant swipe-based navigation system, it had multiprocess app switching (AFAIK before iPhone OS did) and a brilliant newsfeed/notification system. It felt like it really had extraordinary potential. And Elop ditched it.