It’s not been out long, but the official Netflix App for iPhone & iPod Touch is currently #1 in the App Store, the free section that is. It must have had a large amount of downloads, it’s been out just over 24 hours too.
America has Netflix, Europe has Spotify, not really a comparison, I know, but seriously – why don’t Netflix expand to the UK, they must know a huge market exists if it’s already #1 in the US.