None of those are "killer apps" in the classical definition of the phrase. Those are apps that are awesome to you, but not killer apps. People use killer app now to mean any good app, kind of how every model today is a super model if you know their name. Halo was a killer app for xbox 360. People bought xboxes to play halo, hence a killer app. People arent going to buy an android phone to use a music player with a ne…
There is no application I've never heard anyone, other than a Gruber/Scoble like geek saying, "I need to buy an iPhone because of this app". In fact, ask someone who does NOT own an iPhone to name one iPhone application. Just one. Any one will do. I bet most of the time the answer will be a blank stare. If you're lucky you might get "there's Facebook, right?". And maybe if they're a gamer you'll get "Angry Birds" or "Doodle Jump".
The notion of a killer app for phones is a dead notion. People have a need for phones first. Then they decide which one to get. They are NOT looking at apps and deciding that since app X is on iOS that they'll buy a smartphone or an iPhone.