[dan1123]

To be fair, Mac stole 2,6,15, and arguably 16 from the Linux community.

I have some to add:

* Filesystem mounting to make a virtual disk drive out of a file like an ISO file (Linux, PC-BSD, Mac)
* Transparent network extension to Explorer to save directly to FTP, NFS, WebDAV, etc (Linux KDE)
* Real userspace and administration/application separation (Linux, PC-BSD, Mac)
* Real filesystem symbolic links (Linux, PC-BSD, Mac)
* A decent shell

[tacticalogic]

* A decent shell

Have you tried powerhsell?

[Swordmaker]

To be fair, Mac stole 2,6,15, and arguably 16 from the Linux community.

Don't think so on 15 & 16... remember that Mac OS X IS UNIX.