I played seriously with Hurd in the early 2000s, and remember really loving many of its ideas. The user space file systems (which Fuse does for other OSes) were

I played seriously with Hurd in the early 2000s, and remember really loving many of its ideas. The user space file systems (which Fuse does for other OSes) were quite cool. I can't imagine that much of the good stuff Hurd promised hasn't already been adopted by others.