Over at Digital Earth Andy has posted a detailed tutorial on how to take videos of Google Earth, I tackled the same topic in an earlier post, based on his advice.
Its well worth the read but I have a couple of comments:
Background audio: I'm not entirely convinced by the helicopter sound, I don't really think it adds to the experience. I'm more convinced by the music but what about a commentary? Maybe I'm biased coming from a geography education background but if that video were to be used in a lesson a commentary (with or without music) really adds value.
Space Navigator: I have one, they're good but you can use a normal, cheaper joystick instead
Overall though its a great posting, thanks Andy! Brian Norman adds a useful tip in the comments.