Re: Talk to a computer? why would I do that?
It can be a little handy depending on how its done. For example, I use the voice interface on my phone on occasion, almost always to do one of three things. Those are faster to do by voice than by touch. Compare these:
Set a timer:
By voice: Press button, hear tone, say "Set a timer for 25 minutes", done.
By touch: Retrieve phone, type unlock pin, find the clock app, select the timer page, spin the little dial to select 25 minutes, press start, lock phone, done.
Call a contact:
By voice: Press button, hear tone, say "Call name", hold phone to ear.
By touch: Retrieve phone, type unlock pin, find the phone app, press the contacts button, scroll to find the person, press the call button, put phone to ear.
A lot of other things though don't get the speed advantage, and are only useful when you can't use the touch or visual interfaces. A well-done car voice interface would be useful, but I've not seen one. The best cars at least let you use the, usually much better, phone voice interfaces rather than make you use theirs.