Im always amazed with human voices use in computer games. Like those sexy female voices that brief you of a certain mission or those futuristic female voice that is suppose to be a computer AI within the game. how did they do it? what software did they use? any special equipment or just an ordinary headset will do it?

i want to create narration voices in my flash as well as video presentation and i want to do the recording myself and maybe ask one of my sexy female officemates with sexy voice to do the speaking...