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 via link or embed it on their website. While the initial slidecast takes time to set up, future ones can be created more easily, providing a worthwhile return on investment for sharing content.