The correct name for this system is not GNU/Linux. It isn't Linux, either. Linux is just the kernel. GNU is on average less than half of the system sitting on top. Much of what one calls a Linux system is under the BSD or X11 licence.
As long as no one comes up with a better name for it, I'll keep calling it Linux.
Another cool feature of Linux: Copy-on-write paging. Linux can fork a thousand new processes and kill off half of them in the time Windows NT needs to make grillions and grillions of registry accesses when attempting to spawn a single new task. This is why Windows programmers need to bother with multithreading a lot. Under Linux, we only multithread when it makes sense. Otherwise, we fork a new process. We're generally a happier bunch than the Windows folks.