monkey man wrote:Yippee!
Now I'll be able to... hang on... what's this new-fangled certification mean, anyway?
Sounds like geekspeak to me.

It's quite the geek-speak indeed, but it translates into Monkey goodness.
OSX has had UNIX at its core, but it was always tainted with some other developer caveats which meant that real UNIX apps weren't always compatible with it. For example, if your favorite software developer wanted to tap into some aspect of Tiger's UNIX-friendly manner of doing things, there were no guarantees that it would always work.
Official UNIX certification means that software based on UNIX code will be more widely compatible rather than piece-mealed together with some of Apple's own proprietary developer tools and specs.
Now, UNIX code may be of no interest to you on its surface, but in a nutshell (or a banana peel) there will be a cleaner OS for monkeys all around the world as other OSX baggage gets dumped.
This *could* also be related to why Apple has had to drop Carbon frameworking (that old OS9 way of doing things that was ported into OSX) at least as far as 64-bit functionality is concerned. I'm not 100% sure on this, though-- but it at least points to how serious Apple is to get rid of the patches and stop gaps in favor of official support all around.