Here's the Mercury News story today about the free service that eBay-owned Skype is offering to bloggers. In sum, you the blogger visit https://skypecasts.skype.com, and register the time and the subject of the chat discussion you want to have on your site. You then put a link on your Web site, so people can find out about it. While registering at Skype, you can list multiple subjects, or "tags," so that people can search for them from Skype too. The service allows up to a 100 people to participate.

Yahoo and others have offered multiple-person audio chats before, but these Skypecasts are open to the public.