Live Video Broadcasting

We have a quarterly Town Hall event we set-up.  We have an audience of about 100 employees at our local corporate office.  We would like to broadcast a live video stream of the presenters as well as have the presentation available on the screen.  We have another 100+ employees that watch this over the web.
We've been using WebEx Training Center for this, but it's limited in the camera and audio options, and a webcam is just not cutting it anymore.
I want to preface that I'm a PC guy, but we're slowly adopting Apple technology into our company (15 iPhones, 60+ iPads, some MacPro servers for designers, and a couple of MacMinis and MacBooks for testing).
I've done some research and see that Quicktime Broadcaster might be what we're looking for, but I'm hoping the community might be able to help us figure out exactly what we might need.
We'd like the production and end-user experience to be very similar to the Apple Keynote that they do at WWDC every year, but simpler.
HD Video Camera - We only need 1 Camera Angle, however we want the ability to zoom, get HD quality, and have it be a non-web cam, Professional camera.
Audio - We need this for the live stream, recording of the event, and then local amplification for the audience
Lighting - I don't know a ton about this, but we would need some lighting for the presenters to "look better" on the feed.
Teleprompter - We don't need these so people can read from them, but rather we need them to display a timer so the presenters don't go over their alloted presentation time.  We frequently go 20-30 mins over our scheduled times.
Presentation - We have a PowerPoint deck that would need to be presented along with the video feed.
Other devices - Occassionally, we'll need to connect an Apple TV to display something from an ipad, etc. and we'll want that to be streamed as well.
That's it in a nutshell.  I'm an AV geek, and have had a lot of experience setting up basic video productions in the past.  I've used various apps like Finalcut, Sony Vegas, etc. to do post production, but never any software for live broadcast stuff.
I'm thinking it might be better to get a consultant in here to help us set up a system, but if my team of 7 can do it ourselves, we'd rather.
Any help you can offer would be great.  I'm open to using Apple technology obviously, which is why I'm posting here.  And if anyone knows how Apple does their live WWDC Keynote streaming, that would be a great benchmark to use.
Thanks,
David Jackson
IT Operations Manager

Ummm, the same way you broadcast a video file.
You feed the DataSource associated with your web cam through a Processor, program the Processor's tracks to output the encoding you want, and then you send that out via RTP.
And on the receiving end, nothing changes from the video file.

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