Slidecasting involves creating presentations with visual slides and an accompanying audio file. It allows users to easily edit sections without recreating the entire piece. To create a slidecast, users need a slide file (PowerPoint, Keynote, PDF), an MP3 audio file, a Slideshare account, and audio editing software like Audacity. Users upload their slides and audio to Slideshare to sync the audio to slides. They can then share the slidecast publicly via a link. While the initial slidecast takes time to set up, future ones can be created more easily, providing a good return on investment for the content creator.