This has been considered by many people I know, including myself. Strangely, few have given it a try. Practically nobody succeeded. At least there is nothing interesting out there that I would choose to listen. Vito Ceniti from DemoDemo was behind the creation of Web Hosting TV through WHIR, and I was watching those regularly. But then the program was very well created, and should you want to try something like that, you have to really invest in quality shows not to sound amateur.