I've always loved the idea of live broadcast. It gives a sense of community and interaction between the broadcaster's and the users. There is just something about being live that is much more real and more enjoyable than having a pre-recorded show because there are flaws. It doesn't look like you are perfect and it doesn't look like you never make mistakes. It allows the user to relate to you.
I'd like to point out a great new Live broadcast on Tuesday-Sat (Except Fridays) by Leo Laporte at twitlive.tv . They are really doing something awesome there by recording all of their podcasts live and allow a chatroom usually ranging from about 1,000 people in at a time.
If you know another Live Podcast that you'd like me to check out and maybe recommend, put it in the comments or message me on Twitter (chacha102)