As I understand it Tiger introduces a free Screen Reader, "voice over".
If this does everything a screen reader like JAWS can, then I think that alone is enough to make Tiger a milestone release. Stand-alone screen-readers cost $1000+ on their own, and being Apple you just know it will blow the rest out of the water. Plus, I don't think there are any screen readers for OS X at the moment, so there are millions of people being excluded at the moment.
However, looking at their site (
http://www.apple.com/accessibility/voiceover/) it doesn't mention anything about Web browsing capabilities. So perhaps it's juts a screen reader for the OS itself and not a full-functional screen reader. If that is so, then it's nothing very special at all. Can anyone tell me for sure if you can browse the Net with VoiceOver?