Check out this video at CNET of Don McDonald, Intel's VP and general manager of their digital home group, demoing a voice-activated remote for Windows Media Center. Mr. McDonald brags that the remote has absolutely no buttons, but forgets to mention it has almost no functionality either. Watch, as he tries not once, not twice, not thrice - but a whopping four times (with some serious lag on his last attempt) to ask the remote "what time is Family Guy on TV." Also, note how much they trust the abilities of their 'zero button remote'... with all the buttons it actually contains.
I'd say you and your team earned an A for effort Don, but you might have to whip out those tablet PCs and get back to the drawing board on the voice-activation bit. Just be careful the next time you try using it to dictate your product design notes.