I'm curious, has there been any extra development or an influx of new programmers and applications on RiscOS since it's been running on the Pi? I still love the idea of running all my favourite classic applications and games on one when I finally get a Pi, but it'd be cool if there's been some new development too. It'd bode well for Aros I suppose, once it's running native with any luck it'll attract a few of the hobbiests to give it a go and want to give something back.
So I take it at the moment it's pretty much just Linux and RiscOS to choose from on the Pi, with Aros still needing to be hosted on Linux (for now)? I wonder if there have been any attempts to port any other open source OSs like Haiku to the Pi.
I have a dislike of RISCOS that goes right back to my school days... I think most British people my age will agree... It hasn't improved with age

There is a native port of AROS for the pi by Kalamatee, but it is missing a complete USB driver... So no mouse or keyboard input yet... Fingers crossed, Kalamatee will have a go at getting that to work in the not too distant future.
Right now linux works just fine on the pi, but X is a bit heavy for the CPU... It really needs an OpenGL ES based display system.