There are speech recognition chips, might be another way to go, since you only need a few words. Unless the PC will be used for other things, like timing, climate control, tracking power usages, closing the window shades, mixing drinks at the wet bar...
**broken link removed**
from 2001
**broken link removed**
2002
Might be wrong, but think I saw something about Windows Vista and speech recognition. Personally, I'm dreading another Windows upgrade. Figure, I'll get another 2-3 years off this PC, before getting forced into it. It's about 6 years old, so kind of getting near the end of its compatiability.