I'm not able to get the AIR 2 SDK to work with Flex Builder 3. If you have it working can you just post to this thread stating that you've got it working? I've done all the suggestions from other forum posts and there are other folks with the same problem.
I have no problem making the NativeProcessTestFlex app work with FlashBuilder 4 with the latest AIR 2 SDK. I'd rather not spend an additional
$300US to upgrade though.
I ran into some bug in 1.5.3 which is fixed in 2.0.2, so I had to update.
It took me some figuring out, but now I have Air 2 SDK running with Flex Builder 3. In the end it didn't prove to be difficult to do.
That should do the trick!