I have heard some good things about a new Operating System. It is a hard Realtime OS based on the QNX Neutrino microkernel. It will be downloadable for Free for personal use on 26 September. Check it out at http://get.qnx.com
Also check this website http://www.qnxstart.com which was made by some (ex?-) Amiga supporters. This OS was once going to be at the heard of a new Amiga, but in the end Amiga Inc got together with http://www.tao-group.com and I have heard they are doing extrodianary well. Interesting......