So I'm looking for some help, perhaps experience with products,
I'm a big fan of QTSS for this type of application, myself:
<http://www.apple.com/quicktime/streamingserver/>
and use Wirecast for the broadcasting client:
<http://www.telestream.net/wire-cast/overview.htm>
along with a good video camera, a decent set of mics, and a Griffin iMic; I use a portable Behringer mixer for multi-input audio setups.
Something like <http://www.justin.tv> might also be an option.
I'll echo Roland's suggestion.. we use QTSS + Wirecast with great success. I believe our kit includes a reasonably priced JVC camera that does pretty well for the price. We use a simple mixing board with a few mics for presentations / conferences. We even pump the video out with a multicast option for folks who have access. Seems to work pretty well with a relatively low entry cost.