The meaning of Hurd is self-referentially recursive. It intends to be the GNU OS. It seems that it is always "close to ready", and perhaps that is where it always will be. It is interesting that this all started way, way back, before Linux.
There has always been tension between GNU and Linux, but Richard Stallman's explanation of why FSF didn't use Linux is probably accurate - I don't think it was Not Invented Here syndrome.
The Hurd is a microkernel design (meaning kernel services are provided by separate servers), and it is possible to run your own kernel components without affecting other users, and without risking crashing the whole machine. This makes it a very interesting environment for those wanting to learn more about kernel programming.
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Tue Jul 5 12:05:49 2011: TonyLawrence
Seven years later and the web site still says
"The GNU Hurd is under active development. Because of that, there is no stable version."
The project IS very interesting though. Read http://www.gnu.org/software/hurd/community/weblogs/ArneBab/technical-advantages-of-the-hurd.html
I see that they provide a VirtualBox, Xen and QEMU distro as well as a live cd, so it is easy to play with..
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