Voiceprint Password in OS X?



I didn't know where to put this question, so I'm asking in this forum. I'm still a Windows user but I'll change that in the near future. That means I wanna buy a Mac box and I'm searchin' all over the internet to get answers to my questions.

I watched an old keynote from '99 (SeyboldSF Apple Event) where Steve has demonstrated the possibility to use a "Voiceprint Password" for logon - in Mac OS 9. However, I can't find any hint on Google or Apple.com that this feature also exists in Mac OS X. Can you tell me if it exists in OS X or not?

Thank you in advance.