Reply to JGZimmerle, I suppose the idea of running RISC OS on various ARM devices is attractive to because if you compare RISC OS to Vista, Mac OS X or even Linux, RISC OS looked incredibly dated and limited. However, if you compare RISC OS to Windows CE, Palm OS, or an embedded Linux like in the Nokia 770/800, it does not look so bad. Proper multi-tasking, support for multiple CPUs, 3D graphics etc. maybe be present on these types of devices, but it's just not very important like is on the desktop. RISC OS on the desktop is many generations behind the market leaders, on PDA/Tablet style devices it's probably not even one generation behind, in some ways it may even have some advantages.
RISC OS on the desktop is extremely dated, RISC OS on a tablet is not so bad, it's almost like getting free pass to compete in the real world.