The iPhone Simulator gets my MacBook Air "sounding like a 747" as well. Since it isn't made in Flash, I'm left to conclude that:
1) any program that is demanding will cause the fan to come on; and 2) it shouldn't be a big surprise that Flash will cause the fan to come on.
The iPhone Simulator gets my MacBook Air "sounding like a 747" as well. Since it isn't made in Flash, I'm left to conclude that: