Try Menu->Settings->Language & Keyboard->Android Keyboard, from here you can toggle Voice Input. I don't have the 'official' 2.1, but I think I have the 2.1 keyboard (too many updates and such and it's one thing I didn't track).
Wanted to quote this as it does work. If you don't want to use the microphone on the keyboard, do the above and it will put the comma back in place(I really missed the comma, I'm a writing major who <3's commas).
Also, has anyone noticed that the voice thing doesn't actually work very well? I've been told I have a very good voice for radio(no slang/draw/accent) and it still messes up a ton unless I slow down a great deal in speed.