Oh come on...I'm a luddite because I don't want a speech-controlled computer? OK...I had to bite:
First, I notice you ignored my comments about noise. I STILL don't want to be sitting in an office full of people talking to their computers. How obnoxious. I also don't want to have to talk to my computer while I am on the phone (how will it differentiate from me talking to it vs. me talking to someone else?), or while I am trying to watch a TV show (again, it must differentiate my voice from others, PLUS I'll have trouble hearing over my own voice), or while I'm listening to music at 100 watts (I don't see how that would work at all).
That's a good thing about hand-based input: it doesn't interfere with other communications mechanisms.
Second, about the throat pain thing. I use my computer about 10 hours a day, and I've not once had a problem with repetitive stress disorder. I read a pamphlet once about proper ergonomics (that's about all it takes), and I take breaks. If you follow good ergonomics, you don't get RTS, it's as simple as that. If you're too lazy to follow good ergonomics, you do. It's your fault, not the mouse's.
But speaking? You can't possibly NOT put strain on your throat. Yes, you can take breaks, but you can't improve the "ergonomics" of talking.
Third, how come someone gets credit for eye control and I get no credit for bringing up mind control.
After all, mind control would be a hell of a lot more efficient than any of these other input mechanisms. You might be able to type 60 words a minute, but I can think about 1000.
Which brings me to my last point. your point about words per minute is well taken. But computers are used for far more than typing words. Personally, I think voice input is good for specialized operations (like word processing...say if you are a writer), but it would royally suck for programming. I can definitely type ";" faster than i can say "semicolon".
Switching to Eudora right now takes me less than a half a second (click on the dock). Saying, "Switch to Eudora" takes two seconds. That's not an increase in efficiency from where I sit, even IF you could flawlessly get the computer to differentiate my voice from the loud music playing in the background right now, which will be a feat in itself.
I'm not opposed to technological innovation, and I'm happy if voice recognition allows access to computers for people with physical challenges, but for most of us, I just think it's not suited as a primary control mechanism, that's all. It's supplemental, and "fun" at best.