I was really impressed to find out that Apple had filed for UNIX 03 certification. I think this is one of those things that really doesnt make any difference to 99% of their customers. The fact that unix is under the hood is 90% of why I switched to mac’s 4 years ago, but this step really signifies something special. Apple is now one of a very few companies that have certified unix releases (just Sun, IBM and HP).

In the end this really doesnt make any difference to the end user, but I think it really ups the geek cred. And their dedication to the specification will ensure that many existing unix applications can be ported to OS X 10.5 with just a simple recompile.

Via [TUAW](http://weblog.infoworld.com/enterprisemac/archives/2007/07/leopard_gets_un.html)