Jump over to Problogger to check out Jon Morrow's terrific video about speech recognition.  This is a great overview that covers everything from sound cards to microphones to PC set-up to software.  Jon includes a great demo of Dragon as well!

"Speech recognition technology has come a long way in the last few years – in this in depth, informative and inspiring video which Jon Morrow (Associate Editor of Copyblogger and Co-founder of Partnering Profits) shares his first hand insights into speech recognition for bloggers."  

Happy viewing!