I have the same question. I'm also a teacher. Once iOS 5 is out and if I have Apple TV, can I mirror exactly what is on my iPad to project onto my interactive whiteboard without the use of an internet connection? I want a wireless solution so I can walk about the classroom with the iPad but my class has no internet connection, at least not one that I'm ever allowed access to with a non-school device.
I assume I need the following:
iPad2 + iOS 5
Apple TV + iOS 5
HDMI to VGA adapter from Apple TV to PC which is then connected to data projector
Possibly some king of switch to switch between monitor/PC display to projector and Apple TV display to projector