I am excited because the webcasts will hopefully be very well produced and executed. Unfortunately, I have read that her previous webcast "class" for the book "A New Earth" had so many viewers that some people had problems watching the webcast. I hope that they are able to resolve the technical issues this time.
I am also excited because the webcasts are supposed to be interactive, with Oprah and the guests answering viewer questions. I am not sure yet how this technology will work, but hopefully they will make it pretty clear how to submit a question.
Oprah's website has a link to "register" for the webcasts with your name and email address. Even though I registered, I don't believe that I have received any special emails about the webcasts. I was already on the Oprah mailing list though, so maybe it simply adds people to the mailing list. I am hoping that if users go to the Oprah site on the day of a webcast that they will be able to watch the webcast without registering.
Most of the webcasts we put on lyvegyde do not require any kind of registration. One exception that I can think of is O'Reilly (computer/tech book publisher). They host some interesting webcasts that I like to include, but they do require registration and they send you a special link to access the webcast. It is a little bit of a pain and it may mean that not as many people watch the webcast.