so what's the advantage over cygwin? is this intended for people with really small disks?
That said, the heroic efforts to turn Windows into Unix, when on the rare occasion I find myself stuck in a Windows instance, are very highly appreciated.
At one point in my life, I was taking advantage of this to run X on my Linux box (cleaner and a few additional features that Windows didn't offer), with tunneled SSH to Windows to run, among other things, some Windows-based applications (which retained enough commandline features to be usable in this fashion) in an environment which almost fully resembled Unix.
It helped markedly for both productivity and sanity.
Adding the "Command line here" context menu item is nice, too (although that's available by Ctrl+right-click in at least Windows 7 anyway).