Google Earth now contains a Flight Simulator. I've only managed to have a quick playaround with it but it seems you can fly anywhere in the world in either an F-16 or a Cirrus SR22 - I managed to accidentally put the Cirrus down in the middle of my local town centre.
I believe this requires version 4.2 so if you've got anything older you'll need to update.
My wings are like a shield of steel.
Thanks for the info Batfink, Its got some pretty sensitive controls (or i am just rubbish) but i like it so far and i have had a little scoot around my home town!!!!