Dragon Naturally Speaking is a tool that I credit for keeping me on task, even when my hands aren't free. (It's great for holding new babies or when you have problems with your hands -- like carpal tunnel.)
For a limited time (supplies may go fast), Amazon has Nuance's Dragon NaturallySpeaking 12 Home for Windows, model no. K409A-G00-12.0 $20 Plus FREE SHIPPING! Simply put it in your cart at $39.99, then use coupon code "DGWIN8DH" to take $19.99 off the price. This comes with a headset, as well!