Just stumbled across Scrivener, a writing program for the Mac OS.
A very nice program! More polished than YourOtherMind but lacking some features that we have, though its emphasis appears to be more on producing written work within Scrivener (whereas YourOtherMind is more about organizing works and ideas, though the production element is going to be expanded in later versions).
Obviously this means there’s a demand for writing organizers like YourOtherMind and Scrivener.
I don’t have access to a machine capable of running Scrivener but I’ve been reviewing the screenshots and the forums. For those of you out there who have used it and want something similiar for the PC feel free to add comments here on what you like (and maybe don’t like).