winsux.
on my computer, i have 3 OSs, freebsd 4.7, red hat 9.0 and dr-dos 7.03 (with ms windows for workgroups 3.11, the calmira II desktop environment and a lot of gnu tools), now as i said elsewhere, i think if the calmira people and the freedos people could meet in the middle, a fully open source windowsalike could be realistic. at first it would simply be like OS/2 with all the benefits of the open source model, but i wonder how long it would take for it to overtake windows...
all they need to do is come up with some GUI for FreeDOS that will replace mswindows 3.11 and they're off. perhaps some version of xfree86.