TEDxNYED used more than $100,000 of equipment (most of which we rented for ~$9,000) to record/broadcast live in HD. We are currently editing the videos which will be placed on TEDx's YouTube channel. @mjmontagne asked me via Twitter if we would share our AV setup, so I fired up Inspiration and made a quick visual. If you have questions, feel free to ask.
p.s. don't you love the cheesy clipart? I was clearly feeling inspired :)