Yes, you can, and you'll be amazed! With the arrival of MacSpeech Dictate, we can enthusiastically recommend that you DO talk to your Mac.
Not too long ago we would have tried to convince you to try a PC to get the best accuracy in speech recognition. Then MacSpeech introduced MacSpeech Dictate - powered by the Dragon speech recognition engine from Nuance, but built specifically for the Mac. Click below for more details.
(MacSpeech Dictate is for Intel-based Macs only.)