Speech recognition has been evolving for ten years now and is extremely accurate but Dragon has been at 95%+ accuracy for years so I don't know where that 20% improvement statement comes from unless they mean in speed. The TabletPC has speech recognition built into the input utilities that is actually pretty good but not as good as Dragon's. IBM's viaVoice is pretty good too and is sold / supported by ScanSoft just as Dragon is now. There is a video "first look" at the new version of Dragon here:
http://weblog.infoworld.com/udell/2004/11/04.html