If somebody were fairly talented and so inclined, I could see a command line OS (like MS-DOS or CP/M) being thrown together in about a month.
Think about it... that's definately something the mouse-centric Macintosh hasn't seen much of.

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I agree with this! I love many of my Mac programs, but I do not understand the appeal of "The Desktop" in Mac and Windoze... it is like training wheels on a bicycle: once one knows their way around mousing through lots of folders definitely seems like the slow and difficult way to go about things. My root disk is a folder which resides on a desktop, which is in turn really a folder on my actual root drive? How does this make any sense? I have been thinking about this lately and have concluded what is heresy in Mac and Windoze communities alike: that DOS-style console applications are the most productive user interface. Sure, they are classically ugly, but they don't need to be. If I can use my tab and cursor keys, and keyboard shortcuts, then I can fly.

I am not kind of real coder, but here are some other OSs that people have put together. They are x86 but cool just the same:

http://common-lisp.net/project/movitz/movitz.html

http://www.forthos.org/

http://www.returninfinity.com/baremetal.html