LOL @ TJ (sorry, I didn't spot your comment) - hmmm...must dust off the cat-o-nine tails
I hope this article covers just about all you want to know about the XP Speech-to-text program:
http://support.microsoft.com/default...306902&sd=tech
...and this, specifically for Office products:
http://office.microsoft.com/en-gb/as...565111033.aspx