I do have Fluxbuntu and OpenSolaris. I'm not really using these for any purpose other than learning about them. The only operating system I used for the first fourteen years of my life was Windows, in various flavors. Since then, I've come a long way, but this year was really the year where I discovered several things, but most importantly open source software. Considering OpenDarwin is dead, I'd like to hold on to it, as soon it will probably unobtainable except for the source code from apple.
By the way, thanks for the link. Mac CD is lying around somewhere.