Occasionally as part of the many things we undertake in the Rezzable London office, we broadcast conversations and tutorials over an online stream. Setting this up isn't quite as straightforward as it'd seem, as the conversations taking place are on Skype and there is no direct way to stream the audio to a Shoutcast server.
The workaround I came up with was to use the Stereo Mix function which is common in many PC soundcards, which allows recording of any sounds being played. (Note: Some computer soundcards do not allow Stereo Mix, whereas others just have it disabled).