I have worked on educational projects, providing the audio of the textbook readings and conversations, for a nursing course. My video game voice-overs have been limited to fanmade modules thus far. I have also provided voice-overs for answering machine messages and short films. Additionally, I hosted my own classical music radio show on my university's radio station. I described the pieces, occasionally providing my own translations of the foreign lyrics or the music itself, to expose listeners to classical music with explanations for accessibility. I have background in musical theatre and opera.
I use Audacity or Adobe Soundbooth for recording and editing. The area in which I record has material for absorbing what would have been echoes. A windscreen is used to decrease "pops" and serve as an additional filter for sound before it hits the microphone. I use an Isolation Shield to help eliminate other sounds.