I know Jeremiah will disagree with me, but I went onto UStream.tv and watched his live feed from Web2.0Expo, the experience was in a word … surreal.
There was a chat component to the web page where you could talk to other folks , and Jeremiah would sometimes repeat the folks back to the people what we were chatting about. The surreal part is that Jeremiah would talk to me or us and address me via the camera, but I could only respond via chat.
I think this was the first time that I was receiving input from a synchronous device (a LIVE feed) and responding asynchrously (via chat room). I know that there has been chat rooms along with live programming the web, but those are programs and not live videoblogging feed. Thus, making uStream.tv a surreal experience. I can only compare it to the time my friend and i decided to ride my bike together: I pedaled and she steered, very surreal.
I definately think there is something special to this medium and allowing anyone a live feed can open up more publishers, and uh interesting uses. I think Jeremiah did a great job of involving his chat audience to the people he was talking to.
At times he felt like our voice, ears and legs at the conference, but I’m sure he just felt like a monkey…Jeremiah we want to see Dave Hornick! 
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Actually, I do agree with you, it WAS sureal, I talked to Chris Pirillo last night (on normal phone) and he is having the same feeling. We’re still trying to define what this is.
Thanks for noticing all the things I was trying to do. Others are using hat cams, but they’re missing the chatroom interaction (which I think is more real-time than asynchronous..debatable, I know)
Oh yes, David Hornick I tried, signal died…
I guess I pushed the technology to the limit, that was the goal.
[...] Wed Ill be streaming the conference and halls again. Be sure to go into the chat room, where you can interact with me and others. I respond to people in the Chat room, ask your questions to whoever’s on the show, all in real-time. YOU are part of this show as much as I am. Holly has provided a review, and summarizes exactly what I’m trying to achieve. [...]
[...] Jeremiah did a great job of engaging people in conversations, and letting those of us online participate. I was a bit odd, as has been mentioned, having him reply by voice to the questions we typed. The interaction though was top notch and well worth the oddness of the setup. While we did experience some issues with the streaming video, mostly related to getting a steady, reliable and fast wireless connection, it was a very nice way to watch and listen to what is going on. [...]
[...] The above incident gets me thinking about the Web 2.0 bubble. It’s not a large one but it’s finally seeing the limits. Whether it’s the incident where we realize “I know you, I trust you.” trumps any rational argument, the disconnect Holly experiences in a small lifecasting incident, to the ironic success of Lunch 2.0. There is the power in the personal, that no social network is going to replace. [...]