The conference was not over this afternoon and I had already received a few emails and SMS from friends telling me how great of an external screen the iPad could be. And now even Philip Bloom talks about it.
I am currently downloading the iPhone SDK3.2 to investigate the possibility but if it is doable, I am not the one who will do it! Way too complicated!
M. Jobs might call the iPad a magic item, transforming the iPad as an external monitor would require massive coding skills. Why? You would have to port the Canon desktop SDK to the iPad which is near impossible unless you are Canon and have access to the source code. OnOneSoftware did it for the iPhone with their DSLR Remote app by using a little trick: they use a computer as a proxy so they could piggyback on the existing Canon API. The next part would be to resize the feed in real time so it fits on the iPad screen, something I doubt the iPad has the CPU power to do. So you see, it is not really possible in the current context.
It is too early to tell, but one thing is for sure: if it is possible, it will be done! The market for such a product is too big for a developer to ignore! And who knows, maybe the solution will come directly from Canon! (wishful thinking!)
By the way, I am looking for a cocoa/Objectif-C dev for a totally unrelated top secret project…