As for film type, I'm with Francois - it's almost certainly Velvia, by the green tones. I think it may have been rated at 32, rather 50, which is what I used rate it at around the millenium. Scan it using the technology of the time and I reckon it's about there.
I also agree with another point made in this thread - it's not viewed out of choice. If this wasn't the default start-up picture, would it have been more popular than the great 20C images which come to mind more intuitively? I doubt it. Like most, I've seen it loads of times, but never actually looked at it once until reading this thread. And now I've looked at it, it leaves me cold.