If you don't mind spending a bit of money and adding a couple of pounds of weight (and a two hour time limit) to your iPad, this video demonstrates that a simple HDMI wireless extender will allow you to transmit audio and video to a remote presentation system.
After watching the clip, we hopped on Amazon to see what it might take to duplicate this hack; we found the HP Wireless TV Connect (the same product that appears to be in use) for $150, and a
