So MacSpeech is no more. It's now Dragon Dictate. Have to say though, speech recognition has come a long way since IBM's ViaVoice.
I've been trying Dragon Dictation on the iPhone for a few days. It really is very impressive. It's free from the App store. Give it a try, make the Android users green with envy.
You can use it on Android phones too and on Android you can use Dragon Dictation to enter text into any box requiring text input. You don't have to copy and paste as you do on the iphone or ipod touch.