I'm working towards my associate degree in Health Information Management and the software we use at school is DragonNaturally Speaking. I have a copy for myself at home, and I've used it to write fic just so I could have more practice with it (the more you use it, the better it gets because it learns your voice). The only drawback for me is that I don't live alone right now and I can't exactly "write" porn when my parents are around. :D Other than that, I do like it because even though I'm a great typist, my fingers still can't keep up with the words sometimes. You don't have to worry about that with voice recognition software.

Hope that helps!