Skype have a small preview of a new system that will enable you to create broadcasts based on your interests and share them with other people.

Called Skypecasts. Unlike Podcasts, which are entirely one-way, Skypecasts are a way of promoting your forthcoming online discussion and getting a decent multi-way conversation on your chosen topic. Since you all talk via Skype, the conversation is free and I would guess this is the next logical progression from online communities, conferencing systems and IRC to a point where like minded individuals can discuss, in real-time, and around the world, about their favorite topic.