Sure to be appetizing to Linux users, MacOS X is open-source, and uses some FreeBSD code in its kernel, called Darwin. It is crash-resistant, using compartmental techniques to keep the system running even if an application crashes.Only a year from now, Mac users will be catapulated into the a new era, inheriting an OS with protected memory, a mix of new and old APIs, a steely blue look, and an Internet Explorer browser.
If any of you want to get there early, I have an old copy of Win95 around here somewhere..
(I try to be nice. I really do.)