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Here’s my two cents… please be nice to me because I know just enough to make people mad at me. :-X 
OK. OS X is based on BSD Unix. Specifically, it’s Open Darwin. (You can read about it here: http://opendarwin.org/ ) . You can install Open Darwin on x86 as well as ppc machines. So in reality, all you would need to do
is port & compile over to Darwin on your x86 machines. Igor you are right when you say that Mac people don’t like the command line. However, you can create a workable GUI interface that won’t look too bad in very little time (OS X is more forgiving about this than Windows). And if you don’t make a GUI, someone else probably will. Seriously, my experience is that most Mac folks just want to see a little icon next to their clock that says “virus protection running and up to date” when you scroll your mouse over it. If other folks want more than that, then they can use the command line.
The Mac folks who read this forum… back me up here! This makes sense, doesn’t it?