Stumbleupon is an awesome time waster but every now and then it throws up a gem.
The national Museum of the US Air Force has a virtual tour that is one of the best I have ever seen.
If you like you aircraft this is as close as you are going to get to being there. a really well made virtual tour of the museum. My favourite cold war super plane is there - the SR-71 Blackbird.
To back it up they also have a range of resources for teachers -
and a range of fact sheets for every aircraft there.